CVE-2025-4085 — Improper Privilege Management in Mozilla Firefox

CWE-269 — Improper Privilege ManagementCWE-200 — Sensitive Information Exposure9 documents8 sources
Severity
7.1HIGHNVD
EPSS
0.2%
top 59.30%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 29
Latest updateFeb 2

Description

An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:NExploitability: 2.8 | Impact: 4.2

Affected Packages3 packages

▶NVDmozilla/firefox< 138.0
▶NVDmozilla/thunderbird< 138.0
▶Ubuntumozilla/thunderbird< 1:140.7.1+build1-0ubuntu0.22.04.1

🔴Vulnerability Details

3
CVEList
Potential information leakage and privilege escalation in UITour actor↗2025-04-29
▶
GHSA
GHSA-8hvc-6h7p-6mcf: An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privi↗2025-04-29
▶
OSV
CVE-2025-4085: An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privi↗2025-04-29
▶

📋Vendor Advisories

5
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
▶
Red Hat
firefox: thunderbird: Potential information leakage and privilege escalation in UITour actor↗2025-04-29
▶
Debian
CVE-2025-4085: firefox - An attacker with control over a content process could potentially leverage the p...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-31: CVE-2025-4085↗
▶
Mozilla
Mozilla Foundation Security Advisory 2025-28: CVE-2025-4085↗
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CVE-2025-4085 — Improper Privilege Management | cvebase