PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-92061 Mozilla CVE debrief

Mozilla Firefox and Thunderbird users should assess exposure to CVE-2026-92061, a critical vulnerability in the Security: Process Sandboxing component. Defenders should verify if their deployments use affected versions and prioritize patching to prevent potential sandbox escapes. This vulnerability, fixed in Firefox 156 and Thunderbird 156, requires verification of remediation from official Mozilla sources to ensure complete mitigation. Affected deployments must be identified, and patching or upgrading should be prioritized to prevent potential sandbox escapes.

Vendor
Mozilla
Product
Firefox
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-15
Original CVE updated
2026-09-21
Advisory published
2026-09-15
Advisory updated
2026-09-21

Who should care

Defenders responsible for Mozilla Firefox and Thunderbird deployments should assess exposure and prioritize patching to prevent potential sandbox escapes.

Why it matters

CVE-2026-92061 is a critical vulnerability in Mozilla Firefox and Thunderbird's Security: Process Sandboxing component. Defenders should assess exposure, prioritize patching, and verify remediation from official sources.

  • Defenders must verify if their deployments use affected versions.
  • Patching or upgrading to Firefox 156 or Thunderbird 156 is required to address the vulnerability.
  • The vulnerability's scope and remediation require verification from official Mozilla sources.

Technical summary

CVE-2026-92061 is a critical vulnerability in the Security: Process Sandboxing component of Mozilla Firefox and Thunderbird. It was fixed in Firefox 156 and Thunderbird 156. This vulnerability affects the sandboxing component, potentially allowing attackers to escape the sandbox. Defenders should assess exposure, prioritize patching, and verify remediation from official sources.

Defensive priority

Patch or upgrade to Firefox 156 or Thunderbird 156 to address the vulnerability.

Recommended defensive actions

  • Patch or upgrade to Firefox 156
  • Patch or upgrade to Thunderbird 156
  • Verify if deployments use affected versions

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but its scope and remediation require verification from official Mozilla sources. Evidence is limited to CVE and NVD details. Defenders should verify affected versions, review official advisories, and confirm remediation. The vulnerability's impact and mitigation require careful review of official guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-92061 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-92061

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-92061 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-92061

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.