PT-2026-41911 · Mozilla+1 · Thunderbird+2

Mateusz Dobrzyński · Published 2026-05-19 · Updated 2026-06-02 · CVE-2026-8957

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV: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 151 Firefox ESR versions prior to 140.11 Thunderbird versions prior to 151 Thunderbird versions prior to 140.11

Description Privilege escalation exists in the Enterprise Policies component.

Recommendations Update Firefox to version 151. Update Firefox ESR to version 140.11. Update Thunderbird to version 151. Update Thunderbird to version 140.11.

Fix

LPE

DoS

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

ALSA-2026:21378

ALSA-2026:21380

ALSA-2026:21381

ALSA-2026:21382

ALSA-2026:22325

ALSA-2026:22643

CVE-2026-8957

OESA-2026-2392

OESA-2026-2393

OESA-2026-2394

OESA-2026-2465

OPENSUSE-SU-2026:10813-1

OPENSUSE-SU-2026:10863-1

OPENSUSE-SU-2026:10864-1

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 143

• https://errata.rockylinux.org/RLSA-2026:21381 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8950 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:21380 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8957 · Security Note
• https://errata.almalinux.org/8/ALSA-2026-22643.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-22643.html · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-21378.html · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:21382 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2392 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8968 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8974 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-8961 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8957 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-51/#CVE-2026-8957 · Vendor Advisory