| Name | CVE-2026-92057 |
| Description | Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| firefox (PTS) | sid | 157.0-1 | fixed |
| thunderbird (PTS) | bookworm | 1:140.12.0esr-1~deb12u1 | fixed |
| bookworm (security) | 1:140.17.0esr-1~deb12u1 | fixed |
| trixie | 1:140.12.0esr-1~deb13u1 | fixed |
| trixie (security) | 1:140.17.0esr-1~deb13u1 | fixed |
| forky | 1:140.14.0esr-1 | vulnerable |
| sid | 1:153.4.0esr-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| firefox | source | (unstable) | 156.0-1 | | | |
| thunderbird | source | bookworm | (not affected) | | | |
| thunderbird | source | trixie | (not affected) | | | |
| thunderbird | source | (unstable) | 1:153.3.0esr-1 | | | |
Notes
[trixie] - thunderbird <not-affected> (Vulnerable code not present, doesn't affect ESR140)
[bookworm] - thunderbird <not-affected> (Vulnerable code not present, doesn't affect ESR140)
https://www.mozilla.org/en-US/security/advisories/mfsa2026-90/#CVE-2026-92057
https://www.mozilla.org/en-US/security/advisories/mfsa2026-96/#CVE-2026-92057