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VulnerabilityPublished Updated

CVE-2025-11711: There was a way to change the value of JavaScript Object properties that were supposed to be

Source GCVE Database

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Authoritative record:CVE-2025-11711· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 144 : update affected systems when convenient.

Data as of 29 Oct 2026, 23:57 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 144, 140.4, 115.29
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Oct 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 has been fixed in Firefox 144, Firefox ESR 115.29 and 140.4, and Thunderbird 144 and 140.4. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation steps are required as the vendor advisory confirms an official fix is available.

Description

CVE-2025-11711 is a vulnerability in Firefox and Thunderbird where some JavaScript Object properties that were intended to be non-writeable could be modified. This issue affects Firefox versions prior to 144 and Firefox ESR versions prior to 115.29 and 140.4, as well as Thunderbird versions prior to 144 and 140.4. The vulnerability was addressed in Firefox 144 and corresponding ESR and Thunderbird releases.

References

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