Auth bypass in Google Chrome
CVE-2026-91734
Incorrect authorization in Core in Google Chrome on on Windows prior to 153.0.8010.47 allowed a local attacker to execute arbitrary code outside the sandbox via a local program. (Chromium security severity: High)
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
Weakness classification (CWE)
References
- chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0541751… (Release Notes, Vendor Advisory)
- issues.chromium.org/issues/516780835 (Permissions Required)
Frequently asked questions
- What is CVE-2026-91734?
- CVE-2026-91734 is a high-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 7.4/10. Published 2026-09-15.
- How severe is CVE-2026-91734?
- High severity. CVSS v3 base score is 7.4 out of 10.