CVE-2025-1935

MEDIUM

Firefox < 128.8.0 and < 136.0 - Cross-Site Scripting via Default URL Protocol Handler

Title source: llm

Description

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.

References (6)

Core 6

Core References

Mailing List

https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html

Issue Tracking

https://bugzilla.mozilla.org/show_bug.cgi?id=1866661

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-14/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-16/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-17/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-18/

Scores

CVSS v3 4.3

EPSS 0.0023

EPSS Percentile 45.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (7)

mozilla/firefox < 128.8.0

mozilla/firefox < 136.0

Mozilla/Firefox 128.8 - 128.*

Mozilla/Firefox 136

mozilla/thunderbird < 128.8.0

Mozilla/Thunderbird 128.8 - 128.*

Mozilla/Thunderbird 136

Published Mar 04, 2025

Tracked Since Feb 18, 2026