Vulnerability in Mozilla Firefox
CVE-2025-9180
Same-origin policy bypass in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.6% 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: 0.003 · change: +0.000
Affected products
- Mozilla Firefox — versions 115.27, 128.14, 140.2
- Mozilla Thunderbird — versions 128.14, 140.2, 142
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2025-64/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-65/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-66/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-67/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-70/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-71/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-72/ (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-9180?
- CVE-2025-9180 is a high-severity vulnerability in Mozilla Firefox, classified under Origin Validation Error. CVSS score: 8.1/10. Published 2025-08-19.
- How severe is CVE-2025-9180?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2025-9180 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.