CVE-2026-109777
Received Received - Intake

Information Disclosure in Firefox IndexedDB

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

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

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-109777
EUVD
EUVD-2026-98537

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is an information disclosure issue in the Storage: IndexedDB component of Firefox. It was patched in Firefox version 158 and Firefox ESR version 153.5. IndexedDB is a browser-based database system that stores structured data, and a flaw in it could allow unauthorized access to sensitive information.

Detection Guidance

This vulnerability is specific to Firefox and Firefox ESR versions before 158 and 153.5 respectively. Detection involves checking installed Firefox versions. Use commands like 'firefox --version' or 'apt show firefox' (Linux) to verify versions. If versions are below the patched releases, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to access private data stored in IndexedDB, such as user credentials, session tokens, or other sensitive information. This could lead to identity theft, unauthorized account access, or data breaches.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, or other privacy regulations if it results in unauthorized access to personal or health data. Organizations may face fines or legal consequences for failing to protect sensitive information.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the Information disclosure vulnerability in Storage: IndexedDB.

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