CVE-2025-11711CWE-591

CVE-2025-11711

Medium · published October 14, 2025

CVSS v3.1

6.5

EPSS

Percentile

13.1

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 6.5 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0: Not supplied
EPSS: 0.00230 · 13.1th percentile
Weakness: CWE-591 · Sensitive Data Storage in Improperly Locked Memory
Published: 2025-10-14T17:15Z

Affected products (5)

Product	Versions	Fixed in
mozilla/firefox	< 115.29.0	115.29.0
mozilla/firefox	< 144.0	144.0
mozilla/firefox	≥ 116.0, < 140.4.0	140.4.0
mozilla/thunderbird	< 140.4.0	140.4.0
mozilla/thunderbird	≥ 141.0, < 144.0	144.0

References (8)

https://bugzilla.mozilla.org/show_bug.cgi?id=1989978 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-81/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-82/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-83/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html · af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html · af854a3a-2127-422b-91ae-364da2661108 https://www.mozilla.org/security/advisories/mfsa2025-84/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-85/ · [email protected]

EPSS history

Timeline

14 OCT 12:27Z
Some non-writable Object properties could be modified
cvelistv5