CVE-2026-100828
Received Received - Intake

Mitigation Bypass in Firefox ESR and Firefox

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100828
EUVD
EUVD-2026-88806

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox to 157 (inc)
mozilla firefox 157

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 a mitigation bypass in the Bookmarks & History component of Firefox. It allows attackers to bypass certain security measures that were meant to protect user data stored in these components.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' on Linux/macOS or check 'Help > About Firefox' in the GUI. If using ESR, verify version is 153.4 or higher. If using standard Firefox, ensure version is 157 or higher.

Impact Analysis

An attacker could exploit this to access or manipulate your bookmarks or browsing history without proper authorization. This might lead to privacy breaches or unauthorized tracking of your activities.

Mitigation Strategies

Update Firefox to ESR 153.4 or Firefox 157 or later immediately. Disable the Bookmarks & History component if updates are not possible. Monitor Mozilla security advisories for further guidance.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-100828. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart