CVE-2025-11711 — Sensitive Data Storage in Improperly Locked Memory in Mozilla Firefox

CWE-591 — Sensitive Data Storage in Improperly Locked MemoryCWE-284 — Improper Access Control12 documents8 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 91.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedOct 14
Latest updateFeb 2

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

▶NVDmozilla/firefox116.0 — 140.4.0+2
▶NVDmozilla/thunderbird141.0 — 144.0+1
▶Debianmozilla/thunderbird< 1:140.4.0esr-1~deb11u1+3

🔴Vulnerability Details

3
GHSA
GHSA-xp5g-gff9-qvvx: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable↗2025-10-14
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OSV
CVE-2025-11711: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable↗2025-10-14
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CVEList
Some non-writable Object properties could be modified↗2025-10-14
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
thunderbird: firefox: Some non-writable Object properties could be modified↗2025-10-14
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Debian
CVE-2025-11711: firefox - There was a way to change the value of JavaScript Object properties that were su...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-84: CVE-2025-11711↗
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Mozilla
Mozilla Foundation Security Advisory 2025-85: CVE-2025-11711↗
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CVE-2025-11711 — Mozilla Firefox vulnerability | cvebase