What is CVE-2026-91739?

CVE-2026-91739 is a medium-severity vulnerability in Google Chrome, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-09-15.

How severe is CVE-2026-91739?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Google Chrome

CVE-2026-91739

Missing authorization in Transactions Platform in Google Chrome prior to 153.0.8010.47 allowed a remote attacker who had compromised the renderer process to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L.

Affected products

Google Chrome

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

chrome-cve-admin@google.com
chrome-cve-admin@google.com

Frequently asked questions

What is CVE-2026-91739?: CVE-2026-91739 is a medium-severity vulnerability in Google Chrome, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-09-15.
How severe is CVE-2026-91739?: Medium severity. CVSS v3 base score is 4.2 out of 10.