Paper/Archive/CVE-2026-92050

CVE-2026-92050

Mozilla Firefox — Sandbox escape due to race condition in the XPConnect component

EPSS 0.4%CVSS 9.1

critical.is priorityof 100

34

CVSS 9.1 (ADP)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 35.3.353 × 207.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Affected

ProductAffectedFixed inSource

Firefoxsee advisory156CNA

Thunderbirdsee advisory156CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refbugzilla.mozilla.org/show_bug.cgi?id=2061387 refmozilla.org/security/advisories/mfsa2026-90 refmozilla.org/security/advisories/mfsa2026-94