CVE-2026-92068CWE-346

CVE-2026-92068

Medium · published September 15, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
1.0
In the wild
Unconfirmed
What it is

Site isolation issue in the Reader Mode 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
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00105 · 1.0th percentile
Weakness
CWE-346 · Origin Validation Error
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=2058790 · [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
    Site isolation issue in the Reader Mode component
    cvelistv5