PT-2025-18154 · Mozilla+4 · Thunderbird+5

Andrew Mccreight · Published 2025-04-29 · Updated 2026-04-14 · CVE-2025-4085

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:S/C:C/I:P/A:N

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 138 Thunderbird versions prior to 138

Description An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges.

Recommendations For Firefox versions prior to 138, update to version 138 or later. For Thunderbird versions prior to 138, update to version 138 or later.

Fix

LPE

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

ALT-PU-2025-11100

ALT-PU-2025-14599

ALT-PU-2025-6353

ALT-PU-2025-6478

ALT-PU-2025-7695

ALT-PU-2025-7697

BDU:2025-11979

CVE-2025-4085

OPENSUSE-SU-2025:15045-1

USN-7991-1

Affected Products

Alt Linux

Astra Linux

Firefox

Linuxmint

Thunderbird

Ubuntu

References · 152

• https://ubuntu.com/security/CVE-2025-1943 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15045-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-10528 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-8039 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-10536 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2025-31/#CVE-2025-4085 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-5271 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-6427 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-3032 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-6433 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-8035 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-0239 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-7991-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-4085 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2025-28/#CVE-2025-4085 · Vendor Advisory