CVE-2026-109777

4.3Medium

Published 13 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

4.3Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-200

Impact

Remote attackers can read sensitive local storage data if they trick a user into visiting a malicious site. The flaw exposes IndexedDB data without requiring authentication.

Root cause

An information disclosure flaw exists within the Storage: IndexedDB component.

Affected systems

Firefox versions prior to 158, Firefox ESR versions prior to 153.5, and Thunderbird versions prior to 158 and 153.5.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Fix & remediation

Upgrade to Firefox 158, Firefox ESR 153.5, Thunderbird 158, or Thunderbird 153.5. No interim mitigations are listed.

shell

$ sudo apt-get update && sudo apt-get install --only-upgrade firefox thunderbird

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

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

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109777