CVE-2026-8401
critical
CVSS v3
9.8
CVSS v2
—
VIR risk
9.8
Description
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-8401.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-8401
Vendor advisory: security@mozilla.org — https://www.mozilla.org/security/advisories/mfsa2026-45/
Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:21381
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| debian | sid | fixed | 150.0.3-1 |
| debian | bookworm | fixed | 140.11.0esr-1~deb12u1 |
| debian | bullseye | fixed | 140.11.0esr-1~deb11u1 |
| debian | forky | fixed | 140.11.0esr-1 |
| debian | trixie | fixed | 140.11.0esr-1~deb13u1 |
| sles | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| mozilla | firefox | {"endExcluding":"150.0.3"} | 150.0.3 |
References
- https://access.redhat.com/errata/RHSA-2026:21381
- https://bugzilla.mozilla.org/show_bug.cgi?id=2038679
- https://www.mozilla.org/security/advisories/mfsa2026-45/
- https://www.mozilla.org/security/advisories/mfsa2026-47/
- https://www.mozilla.org/security/advisories/mfsa2026-48/
- https://www.mozilla.org/security/advisories/mfsa2026-51/
- https://security-tracker.debian.org/tracker/CVE-2026-8401
- https://www.suse.com/security/cve/CVE-2026-8401.html
CWEs
CWE-693
Verify integrity in audit chain (admin only). AS-IS.