BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2026-55945High confidence

Microsoft Edge (Chromium-based) Information Disclosure Vulnerability

Microsoft · Microsoft Edge (Chromium-based)

4.2MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-41645

No EUVD known-exploited evidence

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

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
4.2 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
01

What, why and how

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

What

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

Why

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

Why

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How

An attacker operating through local access may attempt exploitation with low privileges. 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
local access → Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-362 ↗

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'). The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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

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

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-362
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-41645Official EUVD mapping

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

Official EUVD record
BSI · German · WID-SEC-W-2026-2200Microsoft Edge: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Edge ausnutzen, um erweiterte Berechtigungen zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Spoofing- und Cross-Site-Scripting-Angriffe durchzuführen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0840Multiples vulnérabilités dans Microsoft Edge

rité Microsoft Edge CVE-2026-14150 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14151 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14152 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14153 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14154 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14155 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-14156 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-45488 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-45489 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-55945 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-56645 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-56646 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57974 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57975 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57977 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57981 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57983 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57984 du 03 juillet 2026 Bulletin de sécurité Microsoft Edge CVE-2026-57985 du 03 juillet 2026

Official advisory
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-22Aggiornamenti Mensili Microsoft

a - - CVE-2026-56176 : apre una nuova finestra - - CVE-2026-56175 : apre una nuova finestra - - CVE-2026-56173 : apre una nuova finestra - - CVE-2026-56170 : apre una nuova finestra - - CVE-2026-56169 : apre una nuova finestra - - CVE-2026-56168 : apre una nuova finestra - - CVE-2026-56164 : apre una nuova finestra - Presente CVE-2026-56159 : apre una nuova finestra - - CVE-2026-56157 : apre una nuova finestra - - CVE-2026-56156 : apre una nuova finestra - - CVE-2026-56155 : apre una nuova finestra - Presente CVE-2026-55949 : apre una nuova finestra - - CVE-2026-55948 : apre una nuova finestra - - CVE-2026-55947 : apre una nuova finestra - - CVE-2026-55945 : apre una nuova finestra - - CVE-2026-55944 : apre una nuova finestra - - CVE-2026-55899 : apre una nuova finestra - - CVE-2026-55898 : apre una nuova finestra - - CVE-2026-55145 : apre una nuova finestra - - CVE-2026-55144 : apre una nuova finestra - - CVE-2026-55142 : apre una nuova finestra - - CVE-2026-55141 : apre una nuova finestra - - CVE-2026-55140 : apre una nuova finestra - - CVE-2026-55139 : apre una nuova finestra - - CVE-2026-55138 : apre una nuova finestra - - CVE-2026-55137 : apre una nuova finestra - - CVE-2026-55136 : apre una nuova finestra - - CVE-2026-55135 : apre una nuova finestra - - CVE-2026-55134 : apre una nuova fi

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 not verified
Affected
1.0.0.0 < 150.0.4078.48
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 3 Jul 2026 · Last source change 9 Sept 2026, 19:35 UTC · CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-41645
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-41645↗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-2026-55945 · cve.blacktree.nl