CVE-2026-74959
Undergoing Analysis Undergoing Analysis - In Progress

Mitigation Bypass in Firefox Storage Cache API

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74959
EUVD
EUVD-2026-60758

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox 154
mozilla firefox esr
mozilla firefox to 154 (inc)
mozilla firefox_esr to 140.14 (inc)
mozilla firefox_esr to 153.1 (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 is a mitigation bypass vulnerability in the Storage: Cache API component of Firefox. It allows attackers to bypass security measures that were meant to protect against certain types of attacks. The issue was resolved in Firefox 154 and specific Firefox ESR versions.

Impact Analysis

If exploited, this vulnerability could allow attackers to access sensitive data stored in the browser's cache or perform unauthorized actions. Users running vulnerable Firefox versions may be at risk of data theft or other malicious activities.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a mitigation bypass in the Storage: Cache API component without detailing potential compliance implications.

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR to version 140.14 or later, or Firefox ESR to version 153.1 or later to address the mitigation bypass in the Storage: Cache API component.

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