CVE-2026-92018CWE-693

CVE-2026-92018

Critical · published September 15, 2026

CVSS v3.1
9.6
EPSS
0%
Percentile
24.7
In the wild
Unconfirmed
What it is

Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00328 · 24.7th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-09-15T17:16Z
Affected products (7)
ProductVersionsFixed in
mozilla/firefox< 115.41.0115.41.0
mozilla/firefox≥ 116.0, < 140.16.0140.16.0
mozilla/firefox≥ 141.0, < 153.3.0153.3.0
mozilla/firefox≥ 154.0.0, < 156.0.0156.0.0
mozilla/thunderbird< 140.16.0140.16.0
mozilla/thunderbird≥ 141.0, < 153.3.0153.3.0
mozilla/thunderbird≥ 154.0, < 156.0156.0
References (8)
https://bugzilla.mozilla.org/show_bug.cgi?id=2064287 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-90/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-91/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-92/ · [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/mfsa2026-95/ · [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 12:33Z
    Sandbox escape in the DOM: Core & HTML component
    cvelistv5