CVE-2026-92050CWE-362

CVE-2026-92050

Critical · published September 15, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
34.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00410 · 34.1th percentile
Weakness
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Published
2026-09-15T17:16Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 156.0.0156.0.0
mozilla/thunderbird< 156.0156.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2061387 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-90/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-94/ · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 12:34Z
    Sandbox escape due to race condition in the XPConnect component
    cvelistv5