CVE-2026-92074CWE-693

CVE-2026-92074

High · published September 15, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
1.2
In the wild
Unconfirmed
What it is

Mitigation bypass in the Popup Blocker 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:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00109 · 1.2th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-09-15T17:17Z
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=2063539 · [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
    Mitigation bypass in the Popup Blocker component
    cvelistv5