CVE-2025-4085: firefox Privilege Escalation — Fix

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.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Weakness Type (CWE)

CWE-269 CWE-269

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 138.0
mozilla	thunderbird	< 138.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-28/ https://www.mozilla.org/security/advisories/mfsa2025-31/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1915280

Frequently Asked Questions

What is CVE-2025-4085? +

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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-4085? +

CVE-2025-4085 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-4085? +

CVE-2025-4085 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-4085? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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