CVE-2026-74954
Undergoing Analysis Undergoing Analysis - In Progress

Information Disclosure via Side-Channel in Firefox Storage Cache API

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Information disclosure due to side-channel in the Storage: Cache API component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-74954
EUVD
EUVD-2026-60681

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 153.1 (inc)
mozilla firefox 154
mozilla firefox_esr 153.1

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an information disclosure issue caused by a side-channel attack in the Storage Cache API component of Firefox. It allows unauthorized access to sensitive data through timing or other indirect methods. The issue was addressed in Firefox 154 and Firefox ESR 153.1.

Detection Guidance

This vulnerability is specific to Firefox versions before 154 and Firefox ESR before 153.1. Check installed versions with commands like 'firefox --version' or 'apt list --installed | grep firefox' on Debian-based systems. If outdated, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal sensitive information such as cached data, user credentials, or other private details stored in the browser. This may lead to identity theft, unauthorized account access, or data breaches.

Compliance Impact

This vulnerability could lead to non-compliance with data protection regulations like GDPR or HIPAA by exposing personal or health-related data. Organizations using affected Firefox versions may face legal penalties, fines, or reputational damage due to unauthorized data disclosure.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to 153.1 or later. Use package managers like 'sudo apt update && sudo apt upgrade firefox' for Debian-based systems or download directly from Mozilla's site.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-74954. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart