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CVE-2025-4085 — An attacker with control over a content process could potentially leverage the privileged UITour actor to…

Mozilla · Firefox · Published 29 Apr 2025 · Modified 30 Sept 2026

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.

References

What to do
  1. Check whether Firefox is in your asset inventory.
  2. Patch in the next maintenance window; prioritise internet-facing systems.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2025-4085