CVE-2026-16391
Received Received - Intake

Information Disclosure in Firefox Storage IndexedDB

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16391
EUVD
EUVD-2026-46228

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153 (inc)
mozilla firefox_esr to 140.13 (inc)
mozilla firefox 153
mozilla firefox_esr 140.13

Helpful Resources

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 allows unauthorized access to sensitive data stored in IndexedDB, which is a client-side storage mechanism used by web applications.

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, potentially leading to identity theft or unauthorized account access.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized access to personal or health data. Organizations may face legal penalties, fines, or reputational damage due to data breaches caused by this issue.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to version 140.13 or later to address the Information disclosure in Storage: IndexedDB vulnerability.

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