MajorCritical vulnerability

CVE-2026-109709 (CVSS 8.8)

NVD · officialPublished Oct 13, 2026Risk 37/100

Information disclosure, privilege escalation in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

Technical details

CVSS

8.8

AV:NetworkAC:LowPR:NoneUI:RequiredC:HighI:HighA:High

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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