What is CVE-2025-12905?

CVE-2025-12905 is a medium-severity vulnerability in Google Chrome, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2025-11-08.

How severe is CVE-2025-12905?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Google Chrome

CVE-2025-12905

Inappropriate implementation in Downloads in Google Chrome on Windows prior to 140.0.7339.80 allowed a remote attacker to bypass Mark of the Web via a crafted HTML page. (Chromium security severity: Low)

Published 2025-11-08 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (4.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Chrome — versions 140.0.7339.80
Microsoft Windows

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.html (Vendor Advisory)
issues.chromium.org/issues/431309019 (Permissions Required)

Frequently asked questions

What is CVE-2025-12905?: CVE-2025-12905 is a medium-severity vulnerability in Google Chrome, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2025-11-08.
How severe is CVE-2025-12905?: Medium severity. CVSS v3 base score is 5.4 out of 10.