CVE-2026-92049CWE-416

CVE-2026-92049

High · published September 15, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
13.3
In the wild
Unconfirmed
What it is

Use-after-free in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

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
0.00233 · 13.3th percentile
Weakness
CWE-416 · Use After Free
Published
2026-09-15T17:16Z
Affected products (4)
ProductVersionsFixed in
mozilla/firefox< 153.3.0153.3.0
mozilla/firefox≥ 154.0.0, < 156.0.0156.0.0
mozilla/thunderbird< 153.3.0153.3.0
mozilla/thunderbird≥ 154.0, < 156.0156.0
References (5)
https://bugzilla.mozilla.org/show_bug.cgi?id=2061295 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-90/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-93/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-94/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-96/ · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 12:34Z
    Use-after-free in the Widget: Win32 component
    cvelistv5