CVE-2025-4085

HIGH 7.1

Potential information leakage and privilege escalation in UITour actor

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Apr 29, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1915280 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-28/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-31/

Credits

Andrew McCreight