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CVE-2025-10859VulnerabilityPublished Updated

CVE-2025-10859: Mozilla Firefox for iOS · Vulnerability

Affects Mozilla Firefox for iOSSource CVE Database V5

0

Not known to be exploited · CVSS 4.0 Medium : upgrade to 143.1 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
4.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 143.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 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 2026-10-26.

What to do

Upgrade Mozilla Firefox for iOS to 143.1.

Affected software

ProductAffectedFixed in
Mozilla Firefox for iOSAffected
  • <143.1
Fixed in
  • 143.1

AI-suggested

Users should update to Firefox for iOS version 143.1 or later, where this vulnerability has been fixed. Applying this official patch fully mitigates the issue. No additional mitigation steps are required beyond updating to the fixed version.

Description

Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.

References

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