CVE-2026-92034CWE-346

CVE-2026-92034

Critical · published September 15, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
18.8
In the wild
Unconfirmed
What it is

Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00274 · 18.8th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-09-15T17:16Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 156.0.0156.0.0
mozilla/thunderbird< 156.0156.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2060295 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-90/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-94/ · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 12:33Z
    Site isolation issue in the Graphics component
    cvelistv5