CVE-2026-109777 in Firefox

Summary

by MITRE • 10/13/2026

Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

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• Responsible: Mozilla
• Reservation: 10/13/2026
• Disclosure: 10/13/2026
• Moderation: accepted
• Entry: VDB-417619
• CPE: 20261013
• CWE: CWE-200 (confirmed)
• CVSS: 4.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Insurance, Finance, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-109777
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109777
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-109777/