CVE-2026-74959
critical · 9.1Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
9.1
CVSS
0.5%
EPSS (exploit prob.)
41st
EPSS percentile
2026-08-18
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-693
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox | < 140.14.0 |
| mozilla | firefox | >= 141.0, < 153.1.0 |
| mozilla | thunderbird | < 140.14.0 |
| mozilla | thunderbird | >= 141.0, < 153.1.0 |
Check a specific version with /api/v1/cve/match.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2047853
- https://www.mozilla.org/security/advisories/mfsa2026-74/
- https://www.mozilla.org/security/advisories/mfsa2026-76/
- https://www.mozilla.org/security/advisories/mfsa2026-77/
- https://www.mozilla.org/security/advisories/mfsa2026-78/
- https://www.mozilla.org/security/advisories/mfsa2026-79/
- https://www.mozilla.org/security/advisories/mfsa2026-80/
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-74959