CVE-2026-74934

7.5 highEPSS 0.2%

High (7.5) in mozilla. EPSS 0.2% chance of exploitation in the next 30 days.

Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
CWEs: CWE-200, CWE-284, CWE-346
Published: 2026-08-18
Modified: 2026-08-24
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox
mozilla:thunderbird

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2050584
https://www.mozilla.org/security/advisories/mfsa2026-74/
https://www.mozilla.org/security/advisories/mfsa2026-75/
https://www.mozilla.org/security/advisories/mfsa2026-76/
https://www.mozilla.org/security/advisories/mfsa2026-77/

Check your stack JSON