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Full vulnerability report · 2026
CVE-2026-113867High confidence

Stanza injection in XMPP chat

Mozilla · Thunderbird

9.1CriticalCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded. Verified remediation exists for at least one product or source, but 7 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 severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.40% 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 Thunderbird 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: Within 3 daysRemediation target: Within 90 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 7 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.

5 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 1 affected package state 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 · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.1esr-1~deb13u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian bookwormbookworm · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.1esr-1~deb12u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian forkyforky · sourcethunderbirdAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 4 Nov 2026
Debian sidsid · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.1esr-1Debian Security Tracker ↗Source updated 4 Nov 2026
Ubuntu 24.04 LTSnoble · standard archivethunderbirdUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 4 Nov 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.

2 current
CVE-2026-113867 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitythunderbird: thunderbird: Unauthorized actions via XMPP stanza injection
6 known affected

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

  • thunderbird as a component of Red Hat Enterprise Linux 10
  • thunderbird.src as a component of Red Hat Enterprise Linux 10
  • thunderbird as a component of Red Hat Enterprise Linux 8
  • thunderbird.src as a component of Red Hat Enterprise Linux 8
  • thunderbird as a component of Red Hat Enterprise Linux 9
  • thunderbird.src as a component of Red Hat Enterprise Linux 9
Summary
A flaw was found in Thunderbird. Due to improper escaping of attribute values when serializing outgoing Extensible Messaging and Presence Protocol (XMPP) messages, incoming request data is reflected in automatic responses without sanitization. A remote attacker can exploit this flaw by sending a crafted request that injects arbitrary protocol commands into the client's connection. This allows the attacker to perform unauthorized actions on behalf of the victim without interaction, such as sending messages or modifying contact and subscription settings.
Remediation
Fix deferred
CVE-2026-113867 · CSAF 2.0 · revision 5 · interimSUSE Product Security TeamCVE-2026-113867
156 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
Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
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-2026-105294

No EUVD known-exploited evidence

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

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
9.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded. Verified remediation exists for at least one product or source, but 7 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

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

What

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Why

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Why

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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 → Improper Encoding or Escaping of Output → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
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-116 ↗

CWE-116: Improper Encoding or Escaping of Output. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

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:N/S:U/C:H/I:H/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.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.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-116
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-105294Official EUVD mapping

Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Official EUVD record ↗
BSI · German · WID-SEC-2026-4064Mozilla Produkte (Thunderbird, Firefox ESR und Firefox): Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Thunderbird, Mozilla Firefox ESR und Mozilla Firefox ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen und um Daten zu manipulieren.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1346Avis du CERT-FR

De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire, une atteinte à la confidentialité des données et un déni de service.

Official advisory ↗
CSIRT Italia · Italian · risolte-vulnerabilita-in-prodotti-mozilla-13Risolte vulnerabilità in prodotti Mozilla

Aggiornamenti di sicurezza sanano molteplici vulnerabilità di sicurezza, di cui 5 con gravità “alta”, in Firefox, Firefox ESR e Thunderbird.

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
Thunderbird: 153.5.1 ≤ 153.*, 158.0.1 ≤ *
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 articles2 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.

04

Evidence and provenance

Published 20 Oct 2026 · Last source change 29 Oct 2026, 18:28 UTC · CWE-116 · Improper Encoding or Escaping of Output

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 2026-10-21
European sourceENISA EUVD · EUVD-2026-105294
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD awaiting enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. SeveritySeverity changed from Unknown to Critical.
    Before
    Unknown
    After
    Critical
    CISA ADP ↗
  2. CVSS scoreCVSS score changed from not recorded to 9.1 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
    Before
    not recorded
    After
    9.1 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
    CISA ADP ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: suse.com/CVE-2026-113867 to remediation: suse.com/CVE-2026-113867.
    Before
    remediation: suse.com/CVE-2026-113867
    After
    remediation: suse.com/CVE-2026-113867
    SUSE Product Security Team ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    SUSE Product Security Team ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    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; 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; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP4; and 135 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; 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; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP4; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP4; and 126 more
    SUSE Product Security Team ↗
  6. ENISA EUVD mappingEUVD-2026-105294 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-105294"}
    ENISA EUVD ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
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-2026-105294↗Vendor CSAF · Red Hat Product Security↗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-2026-113867 · cve.blacktree.nl