CVE-2026-74934

HighCVSS 7.5

Published: 18/08/2026(UTC)Updated: 21/08/2026(UTC)Translated: 19/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.17%

7th percentile - higher than 7% of all known CVEs

Summary

Site isolation issue in the Graphics: CanvasWebGL component of Firefox and Thunderbird. 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.

Risk Assessment

May allow breach of site isolation, posing a risk to user privacy and security.

Recommendation

Update Firefox or Thunderbird to a patched version.

Original NVD description (English source)

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.