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VulnerabilityPublished Updated

CVE-2025-1935: A web page could trick a user into setting that site as the default handler for a custom URL protocol

Source GCVE Database

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Authoritative record:CVE-2025-1935· Medium 4.3

Not known to be exploited · CVSS 4.3 Medium · fixed in 136 : update affected systems when convenient.

Data as of 30 Oct 2026, 01:15 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 136, 128.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Mar 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

AI-suggested

This vulnerability is fixed in Firefox 136 and Firefox ESR 128.8. Users and administrators should update to these versions or later to mitigate the issue. No additional action is required once updated, as the fix addresses the vulnerability directly.

Description

CVE-2025-1935 is a low-severity vulnerability in Firefox versions prior to 136 and Firefox ESR prior to 128.8. It allows a web page to trick a user into setting that site as the default handler for a custom URL protocol via clickjacking the registerProtocolHandler info-bar. This could lead to unintended protocol handling by the malicious site.

References

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