Incorrect Privilege Assignment Affecting thunderbird package, versions <0:140.11.0-1.el9_4


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.39% (31st percentile)

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  • Snyk IDSNYK-RHEL9-THUNDERBIRD-17358945
  • published17 Jun 2026
  • disclosed19 May 2026

Introduced: 19 May 2026

CVE-2026-8957  (opens in a new tab)
CWE-266  (opens in a new tab)

How to fix?

Upgrade RHEL:9 thunderbird to version 0:140.11.0-1.el9_4 or higher.
This issue was patched in RHSA-2026:26174.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS Base Scores

version 3.1