What is CVE-2025-12909?

CVE-2025-12909 is a medium-severity vulnerability in Google Chrome, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2025-11-08.

How severe is CVE-2025-12909?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Google Chrome

CVE-2025-12909

Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. (Chromium security severity: Low)

EPSS: 0.002 (9.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Google Chrome — versions 140.0.7339.80

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

chrome-cve-admin@google.com (Vendor Advisory)
chrome-cve-admin@google.com (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2025-12909?: CVE-2025-12909 is a medium-severity vulnerability in Google Chrome, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2025-11-08.
How severe is CVE-2025-12909?: Medium severity. CVSS v3 base score is 5.3 out of 10.