PT-2026-102601 · Mozilla · Firefox Esr+2

Rintaro Kawasugi

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CVE-2026-100828

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Published

2026-09-29

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Updated

2026-09-30

CVSS v3.1

9.6

Critical

VectorAV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157
Description A mitigation bypass exists within the Bookmarks & History component.
Recommendations Update Firefox to version 157. Update Firefox ESR to version 153.4. Update Thunderbird to version 157.

Fix

Protection Mechanism Failure

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dbugs@ptsecurity.com

Weakness Enumeration

CWE-693

Related Identifiers

CVE-2026-100828
OPENSUSE-SU-2026:11917-1
OPENSUSE-SU-2026:21980-1

Affected Products

Firefox
Firefox Esr
Thunderbird