PT-2026-102594 · Mozilla · Firefox+1

Tran Quac

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CVE-2026-100820

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Published

2026-09-29

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Updated

2026-09-30

CVSS v3.1

8.8

High

VectorAV:N/AC:L/PR:N/UI:R/S:U/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 Firefox ESR versions prior to 140.17 Thunderbird versions prior to 157
Description Privilege escalation exists within the Address Bar component.
Recommendations Update Firefox to version 157. Update Firefox ESR to version 153.4. Update Firefox ESR to version 140.17. Update Thunderbird to version 157.

Fix

LPE

Improper Privilege Management

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2026-100820
OPENSUSE-SU-2026:11917-1
OPENSUSE-SU-2026:21980-1

Affected Products

Firefox
Thunderbird