CVE-2026-74965CWE-269privilege-escalation

CVE-2026-74965

High · published August 18, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
37.6
In the wild
Unconfirmed
What it is

Privilege escalation in the Shell Integration 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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00444 · 37.6th percentile
Weakness
CWE-269 · Improper Privilege Management
Published
2026-08-18T17:17Z
Affected products (6)
ProductVersionsFixed in
mozilla/firefox< 140.14.0140.14.0
mozilla/firefox< 154.0.0154.0.0
mozilla/firefoxall versions—
mozilla/thunderbird< 140.14.0140.14.0
mozilla/thunderbird< 154.0154.0
mozilla/thunderbird≥ 153.0, < 153.1.0153.1.0
References (7)
https://bugzilla.mozilla.org/show_bug.cgi?id=2053455 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-74/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-76/ · [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/mfsa2026-79/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-80/ · [email protected]
EPSS history
Timeline
  • 18 AUG 12:23Z
    Privilege escalation in the Shell Integration component
    cvelistv5