CVE-2025-11711

Name: CVE-2025-11711
Creator: NVD / NIST
Published: 2025-10-14T13:15:37.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2025-11711 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.21%

11.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-591

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.29.0
Mozilla	Firefox	< 144.0
Mozilla	Firefox	>= 116.0, < 140.4.0
Mozilla	Thunderbird	< 140.4.0
Mozilla	Thunderbird	>= 141.0, < 144.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1989978Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-81/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-82/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-83/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-84/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-85/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html

Timeline

Published: Oct 14, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-11711?

How severe is CVE-2025-11711?

CVE-2025-11711 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2025-11711?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-11711?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST