What is CVE-2025-13015?

CVE-2025-13015 is a low-severity vulnerability in Mozilla Firefox, classified under Authentication Bypass by Spoofing. CVSS score: 3.4/10. Published 2025-11-11.

How severe is CVE-2025-13015?

Low severity. CVSS v3 base score is 3.4 out of 10.

Vulnerability in Mozilla Firefox

CVE-2025-13015

Spoofing issue in Firefox. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, and Firefox ESR 115.30.

Published 2025-11-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.4 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Mozilla Firefox — versions 115.30, 140.5, 145

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
www.mozilla.org/security/advisories/mfsa2025-87/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-88/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-89/ (Vendor Advisory)

Frequently asked questions

What is CVE-2025-13015?: CVE-2025-13015 is a low-severity vulnerability in Mozilla Firefox, classified under Authentication Bypass by Spoofing. CVSS score: 3.4/10. Published 2025-11-11.
How severe is CVE-2025-13015?: Low severity. CVSS v3 base score is 3.4 out of 10.