CVE-2026-91734 Auth bypass in Chrome

What is CVE-2026-91734?

CVE-2026-91734 is a high-severity authentication bypass vulnerability in Google Chrome, published on 15 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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)

Weakness: CWE-863

Which versions are affected by CVE-2026-91734?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-91734?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-91734 being exploited?

There is no known exploitation of CVE-2026-91734 in the wild and no public exploit code.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-87491 Google Chromium V8 Out of Bounds Write Exploited High 8.8
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-91734, ECHO-e36b-c85b-95fd, GHSA-p2gj-6m34-2678, MINI-v286-qc8j-57r4.