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Google CVE-2026-91748

| EUVDEUVD-2026-79964 HIGH
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-09-15 chrome-cve-admin@google.com GHSA-j9p5-vxxc-fg26
8.3
CVSS 3.1 · Vendor: google
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Severity by source

Vendor (google) PRIMARY
8.3 HIGH
AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Primary rating from Vendor (google) · only source for this CVE.

CVSS VectorVendor: google

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Sep 16, 2026 - 00:24 vuln.today
CVSS changed
Sep 16, 2026 - 00:22 NVD
8.3 (HIGH)
CVE Published
Sep 15, 2026 - 21:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 15, 2026 - 21:16 cve.org
HIGH 8.3

DescriptionCVE.org

Race condition in Extensions in Google Chrome on on Mac prior to 153.0.8010.47 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to potentially execute arbitrary code outside the sandbox via UI Interaction. (Chromium security severity: High)

AnalysisAI

A time-of-check-to-time-of-use race condition in the Extensions component of Google Chrome on macOS allows an attacker to break out of the renderer sandbox and execute arbitrary code in the browser process context. The barrier to entry is meaningful: the attacker must already have compromised the renderer process through a separate bug and then use social engineering to persuade the victim into a specific UI interaction that widens the race window. …

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CVE-2026-91748 vulnerability details – vuln.today

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