CVE-2026-74952CWE-269privilege-escalation

CVE-2026-74952

High · published August 18, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
34.7
In the wild
Unconfirmed
What it is

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2.

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
0.00415 · 34.7th percentile
Weakness
CWE-269 · Improper Privilege Management
Published
2026-08-18T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 154.0.0154.0.0
mozilla/thunderbird< 154.0154.0
References (5)
https://bugzilla.mozilla.org/show_bug.cgi?id=2021757 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-74/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-78/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-85/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-88/ · [email protected]
EPSS history
Timeline
  • 18 AUG 12:23Z
    Privilege escalation in the Application Update component
    cvelistv5