CVE-2026-92038

CRITICAL 9.1CVE-2026-92038 · Published 15/09/2026 · updated 05/10/2026

Package	Affected versions	Patched versions
firefox mozilla	`≥ 154.0.0, < 156.0.0< 153.3.0`	`156.0.0153.3.0`
thunderbird mozilla	`≥ 154.0, < 156.0< 153.3.0`	`156.0153.3.0`

Description

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2026-90 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-93 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-94 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-96 · Vendor Advisory

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free