Skip to main content
VulnerabilityPublished Updated

CVE-2025-1939: Mozilla Firefox · CWE-359

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · CVSS 3.9 Low : upgrade to 136 when convenient.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score
3.9Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 136
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/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. Weaponised: 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 26 Oct 2026.

What to do

Upgrade Mozilla Firefox to 136.

Affected software

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <136
Fixed in
  • 136

AI-suggested

This vulnerability is fixed in Mozilla Firefox version 136. Users and administrators should update to Firefox 136 or later to remediate this issue. No additional mitigation actions are required beyond applying the official update.

Description

Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking. This vulnerability was fixed in Firefox 136.

References

Community reviews

Loading reviews…