CVE-2026-74981CWE-346

CVE-2026-74981

High · published August 18, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
10.6
In the wild
Unconfirmed
What it is

Site isolation issue in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00209 · 10.6th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-08-18T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 153.1.0153.1.0
mozilla/thunderbird< 153.1.0153.1.0
References (5)
https://bugzilla.mozilla.org/show_bug.cgi?id=2050480 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-74/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-77/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-78/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-80/ · [email protected]
EPSS history
Timeline
  • 18 AUG 12:23Z
    Site isolation issue in the Audio/Video: Web Codecs component
    cvelistv5