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Full vulnerability report · 2026
CVE-2026-100766High confidence

Information disclosure in the Networking: JAR component

Mozilla · Firefox

4.3MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 2 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.27% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Mozilla Firefox and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 2 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

11 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 2 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.4.0esr-1~deb13u1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian trixietrixie · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.17.0esr-1~deb13u1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian bookwormbookworm · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.4.0esr-1~deb12u1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian bookwormbookworm · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.17.0esr-1~deb12u1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian forkyforky · sourcefirefox-esrAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 3 Oct 2026
Debian forkyforky · sourcethunderbirdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 3 Oct 2026
Debian sidsid · sourcefirefoxVendor fix publishedDebian records a fixed source-package version for this release.157.0-1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian sidsid · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.4.0esr-1Debian Security Tracker ↗Source updated 3 Oct 2026
Debian sidsid · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.4.0esr-1Debian Security Tracker ↗Source updated 3 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivemozjs102Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 2 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivemozjs115Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 2 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-100766 · CSAF 2.0 · revision 6 · interimSUSE Product Security TeamCVE-2026-100766
176 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • MozillaFirefox as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1
Summary
Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-88918

No EUVD known-exploited evidence

Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
4.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 2 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

What

Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Why

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may obtain information outside the intended access boundary.

What

Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Why

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may obtain information outside the intended access boundary.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Exposure of Sensitive Information to an Unauthorized Actor → obtain information outside the intended access boundary
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-200 ↗

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-200
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-88918Official EUVD mapping

Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3654Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox ESR, Mozilla Firefox und Thunderbird ausnutzen, um beliebigen Programmcode auszuführen, Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren, einen Denial-of-Service-Zustand auszulösen oder andere, nicht näher spezifizierte Angriffe zu starten.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1244Multiples vulnérabilités dans Mozilla Thunderbird

757 Référence CVE CVE-2026-100758 https://www.cve.org/CVERecord?id=CVE-2026-100758 Référence CVE CVE-2026-100759 https://www.cve.org/CVERecord?id=CVE-2026-100759 Référence CVE CVE-2026-100760 https://www.cve.org/CVERecord?id=CVE-2026-100760 Référence CVE CVE-2026-100761 https://www.cve.org/CVERecord?id=CVE-2026-100761 Référence CVE CVE-2026-100762 https://www.cve.org/CVERecord?id=CVE-2026-100762 Référence CVE CVE-2026-100763 https://www.cve.org/CVERecord?id=CVE-2026-100763 Référence CVE CVE-2026-100764 https://www.cve.org/CVERecord?id=CVE-2026-100764 Référence CVE CVE-2026-100765 https://www.cve.org/CVERecord?id=CVE-2026-100765 Référence CVE CVE-2026-100766 https://www.cve.org/CVERecord?id=CVE-2026-100766 Référence CVE CVE-2026-100767 https://www.cve.org/CVERecord?id=CVE-2026-100767 Référence CVE CVE-2026-100768 https://www.cve.org/CVERecord?id=CVE-2026-100768 Référence CVE CVE-2026-100769 https://www.cve.org/CVERecord?id=CVE-2026-100769 Référence CVE CVE-2026-100770 https://www.cve.org/CVERecord?id=CVE-2026-100770 Référence CVE CVE-2026-100771 https://www.cve.org/CVERecord?id=CVE-2026-100771 Référence CVE CVE-2026-100772 https://www.cve.org/CVERecord?id=CVE-2026-100772 Référence CVE CVE-2026-100773 https://www.cve.org/CVERecord?id=CVE-2026-100773 Référence CVE CVE-2026-100774 https://www.cve.o

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1240Multiples vulnérabilités dans les produits Mozilla

757 Référence CVE CVE-2026-100758 https://www.cve.org/CVERecord?id=CVE-2026-100758 Référence CVE CVE-2026-100759 https://www.cve.org/CVERecord?id=CVE-2026-100759 Référence CVE CVE-2026-100760 https://www.cve.org/CVERecord?id=CVE-2026-100760 Référence CVE CVE-2026-100761 https://www.cve.org/CVERecord?id=CVE-2026-100761 Référence CVE CVE-2026-100762 https://www.cve.org/CVERecord?id=CVE-2026-100762 Référence CVE CVE-2026-100763 https://www.cve.org/CVERecord?id=CVE-2026-100763 Référence CVE CVE-2026-100764 https://www.cve.org/CVERecord?id=CVE-2026-100764 Référence CVE CVE-2026-100765 https://www.cve.org/CVERecord?id=CVE-2026-100765 Référence CVE CVE-2026-100766 https://www.cve.org/CVERecord?id=CVE-2026-100766 Référence CVE CVE-2026-100767 https://www.cve.org/CVERecord?id=CVE-2026-100767 Référence CVE CVE-2026-100768 https://www.cve.org/CVERecord?id=CVE-2026-100768 Référence CVE CVE-2026-100769 https://www.cve.org/CVERecord?id=CVE-2026-100769 Référence CVE CVE-2026-100770 https://www.cve.org/CVERecord?id=CVE-2026-100770 Référence CVE CVE-2026-100771 https://www.cve.org/CVERecord?id=CVE-2026-100771 Référence CVE CVE-2026-100772 https://www.cve.org/CVERecord?id=CVE-2026-100772 Référence CVE CVE-2026-100773 https://www.cve.org/CVERecord?id=CVE-2026-100773 Référence CVE CVE-2026-100774 https://www.cve.o

Official advisory ↗
CSIRT Italia · Italian · risolte-vulnerabilita-in-prodotti-mozilla-11Risolte vulnerabilità in prodotti Mozilla

a - - CVE-2026-100780 : apre una nuova finestra - - CVE-2026-100779 : apre una nuova finestra - - CVE-2026-100778 : apre una nuova finestra - - CVE-2026-100777 : apre una nuova finestra - - CVE-2026-100776 : apre una nuova finestra - - CVE-2026-100775 : apre una nuova finestra - - CVE-2026-100774 : apre una nuova finestra - - CVE-2026-100773 : apre una nuova finestra - - CVE-2026-100772 : apre una nuova finestra - - CVE-2026-100771 : apre una nuova finestra - - CVE-2026-100770 : apre una nuova finestra - - CVE-2026-100769 : apre una nuova finestra - - CVE-2026-100768 : apre una nuova finestra - - CVE-2026-100767 : apre una nuova finestra - - CVE-2026-100766 : apre una nuova finestra - - CVE-2026-100765 : apre una nuova finestra - - CVE-2026-100764 : apre una nuova finestra - - CVE-2026-100763 : apre una nuova finestra - - CVE-2026-100762 : apre una nuova finestra - - CVE-2026-100761 : apre una nuova finestra - - CVE-2026-100760 : apre una nuova finestra - - CVE-2026-100759 : apre una nuova finestra - - CVE-2026-100758 : apre una nuova finestra - - CVE-2026-100757 : apre una nuova finestra - - CVE-2026-100756 : apre una nuova finestra - - Riferimenti (7) https://www.mozilla.org/en-US/security/advisories/mfsa2026-97/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-98/ https://www.mozil

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles4 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

  • Security Vulnerabilities fixed in Firefox ESR 153.4 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 153.4 Announced September 29, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 153.4 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisor
  • Security Vulnerabilities fixed in Firefox 157 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox 157 Announced September 29, 2026 Impact high Products Firefox Fixed in Firefox 157 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisory for every indi
  • Security Vulnerabilities fixed in Firefox ESR 115.42 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 115.42 Announced September 29, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 115.42 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advis
  • Security Vulnerabilities fixed in Firefox ESR 140.17 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 140.17 Announced September 29, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 140.17 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advis
04

Evidence and provenance

Published 29 Sept 2026 · Last source change 30 Sept 2026, 17:20 UTC · CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-30
European sourceENISA EUVD · EUVD-2026-88918
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCISA ADP
NVD statusNVD enrichment underway

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-devel; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-translations-common; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-translations-other; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-devel; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-translations-common; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-translations-other; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox-translations-common; and 44 more
    After
    MozillaFirefox as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-devel as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP3; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP3; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP3; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-other; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; and 146 more
    SUSE Product Security Team ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    After
    SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-devel; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-translations-common; SUSE Linux Enterprise Desktop 15 SP7:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS:MozillaFirefox-translations-other; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:MozillaFirefox-translations-other; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-devel; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-translations-common; SUSE Linux Enterprise Module for Desktop Applications 15 SP7:MozillaFirefox-translations-other; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise Server 12 SP5-LTSS:MozillaFirefox-translations-common; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox-devel; SUSE Linux Enterprise Server 15 SP4-LTSS:MozillaFirefox-translations-common; and 44 more
    SUSE Product Security Team ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526; removed remediation: mozilla.org/mfsa2026-101.
    Before
    remediation: mozilla.org/mfsa2026-101
    After
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526
    CNA ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: added remediation: mozilla.org/mfsa2026-101; removed remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526.
    Before
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526
    After
    remediation: mozilla.org/mfsa2026-101
    CNA ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 115.42 ≤ 115.*, 140.17 ≤ 140.*, 153.4 ≤ 153.*, 157 ≤ *
    After
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 115.42 ≤ 115.*, 140.17 ≤ 140.*, 153.4 ≤ 153.*, 157 ≤ *; Thunderbird: 140.17 ≤ 140.*, 153.4 ≤ 153.*, 157 ≤ *
    CNA ↗
  6. ENISA EUVD mappingEUVD-2026-88918 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-88918"}
    ENISA EUVD ↗
  7. SeveritySeverity changed from Unknown to Medium.
    Before
    Unknown
    After
    Medium
    CISA ADP ↗
  8. CVSS scoreCVSS score changed from not recorded to 4.3 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
    Before
    not recorded
    After
    4.3 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
    CISA ADP ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: added remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526; removed patch: mozilla.org/mfsa2026-100; removed patch: mozilla.org/mfsa2026-97; 3 further removals.
    Before
    patch: mozilla.org/mfsa2026-100 · patch: mozilla.org/mfsa2026-97 · patch: mozilla.org/mfsa2026-98 · 2 more references
    After
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2061526
    CNA ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the linked Mozilla advisory for the product-specific affected versions. · Fixed: Firefox ESR 153.4; Firefox ESR 140.17; Firefox ESR 115.42; Firefox 157
    After
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 115.42 ≤ 115.*, 140.17 ≤ 140.*, 153.4 ≤ 153.*, 157 ≤ *
    CNA ↗
  11. SeveritySeverity changed from High to Unknown.
    Before
    High
    After
    Unknown
    CVE.org ↗
  12. Catalogue recordCVE added to the BlackTree catalogue.
    Authoritative vendor security advisory ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-88918↗Vendor CSAF · SUSE Product Security Team↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-100766 · cve.blacktree.nl