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PatchSiren cyber security CVE debrief

CVE-2026-12313 Mozilla CVE debrief

CVE-2026-12313 is an information disclosure and sandbox escape vulnerability in the Security: Process Sandboxing component. This issue was addressed in Firefox 152 and Firefox ESR 140.12.

Vendor
Mozilla
Product
Firefox
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Users of Firefox and Firefox ESR

Technical summary

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

Defensive priority

high

Recommended defensive actions

  • Apply updates to Firefox and Firefox ESR to versions 152 and 140.12 respectively.

Evidence notes

Vendor: Mozilla (based on evidence).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12313 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12313

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

  • CVE-2026-12313 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12313

    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.