Critical severity · published Sep 15, 2026
CVE-2026-92045
Sandbox escape due to incorrect boundary conditions in the WebRTC component
9.6
CVSS
0.3%
EPSS
No
On KEV
Description
Sandbox escape due to incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 153.3.0; 154.0.0 before 156.0.0 · source: NVD
TH
Thunderbird · Mozilla
before 153.3.0; 154.0 before 156.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92045
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92045
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=2054622
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-90/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-93/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-94/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-96/
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