CVE-2025-1935
MEDIUM severity · CVSS 4.3 · Cross-site scripting (XSS)
4.3CVSS MEDIUM
Summary
A web page could trick a user into setting that site as the default handler for a custom URL protocol. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactLow
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Affected products we track (2)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2025-14/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-16/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-17/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-18/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1866661
- https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html