CVE-2026-92014 Mozilla CVE debrief

Who should care

Defenders responsible for Mozilla Firefox and Thunderbird deployments should assess exposure and prioritize patching to prevent potential privilege escalation attacks. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Managed environments with Firefox or Thunderbird deployments should

Why it matters

CVE-2026-92014 is a high-severity privilege escalation vulnerability in Mozilla Firefox and Thunderbird that requires verification of affected versions and prompt patching to prevent potential exploitation.

• Verification of affected software versions is required to prevent potential exploitation
• Patching Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16 is necessary to fix the vulnerability
• Monitoring for potential exploitation attempts is recommended

Technical summary

CVE-2026-92014 is a high-severity privilege escalation vulnerability in the Graphics component of Mozilla Firefox and Thunderbird. The vulnerability was caused by incorrect boundary conditions. It was fixed in Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16. Defenders should prioritize patching these versions and verify exposure for earlier versions of Firefox and Thunderbird. The CVSS score of 8.8 indicates a high severity vulnerability that requires prompt attention. Affected product context includes Mozilla Firefox and Thunderbird users.

Defensive priority

Defenders should prioritize patching Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16, and verify exposure for earlier versions.

Recommended defensive actions

• Apply patches from Mozilla for Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16
• Verify exposure for earlier versions of Firefox and Thunderbird
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.8 and affected software versions. Defenders should verify exposure for earlier versions of Firefox and Thunderbird. The vulnerability was fixed in Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16. Evidence limits suggest that additional information may be available from Mozilla or other sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.