CVE-2025-11711
published 2025-10-14CVE-2025-11711: 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…
PriorityP428medium6.5CVSS 3.1
AVNACLPRNUIRSUCNIHAN
EPSS
0.21%
11.8th percentile
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.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 144.0-1 (sid) | firefox 144.0-1 (sid) |
| debian | firefox-esr | < firefox 144.0-1 (sid) | firefox 144.0-1 (sid) |
| debian | thunderbird | < firefox 144.0-1 (sid) | firefox 144.0-1 (sid) |
| mozilla | firefox | < 115.29.0 | 115.29.0 |
| mozilla | firefox | < 144.0 | 144.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.4.0 | 140.4.0 |
| mozilla | thunderbird | < 140.4.0 | 140.4.0 |
| mozilla | thunderbird | >= 0 < 1:140.4.0esr-1~deb11u1 | 1:140.4.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:140.4.0esr-1~deb12u1 | 1:140.4.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:140.4.0esr-1~deb13u1 | 1:140.4.0esr-1~deb13u1 |
| mozilla | thunderbird | >= 0 < 1:140.4.0esr-1 | 1:140.4.0esr-1 |
| mozilla | thunderbird | >= 141.0 < 144.0 | 144.0 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_redhat6.5MEDIUM
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Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
thunderbird: firefox: Some non-writable Object properties could be modified
vendor_redhat·2025-10-14·CVSS 6.5
CVE-2025-11711 [MEDIUM] CWE-284 thunderbird: firefox: Some non-writable Object properties could be modified
thunderbird: firefox: Some non-writable Object properties could be modified
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability affects Firefox < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
A flaw was found in Thunderbird and Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise
Debian
CVE-2025-11711: firefox - There was a way to change the value of JavaScript Object properties that were su...
vendor_debian·2025·CVSS 6.5
CVE-2025-11711 [MEDIUM] CVE-2025-11711: firefox - There was a way to change the value of JavaScript Object properties that were su...
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability affects Firefox < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
Scope: local
sid: resolved (fixed in 144.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-84: CVE-2025-11711
vendor_mozilla·CVSS 6.5
CVE-2025-11711 [MEDIUM] Mozilla Foundation Security Advisory 2025-84: CVE-2025-11711
Mozilla Foundation Security Advisory 2025-84
CVE: CVE-2025-11711
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 144
Mozilla
Mozilla Foundation Security Advisory 2025-85: CVE-2025-11711
vendor_mozilla·CVSS 6.5
CVE-2025-11711 [MEDIUM] Mozilla Foundation Security Advisory 2025-85: CVE-2025-11711
Mozilla Foundation Security Advisory 2025-85
CVE: CVE-2025-11711
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.4
Mozilla
Mozilla Foundation Security Advisory 2025-83: CVE-2025-11711
vendor_mozilla·CVSS 6.5
CVE-2025-11711 [MEDIUM] Mozilla Foundation Security Advisory 2025-83: CVE-2025-11711
Mozilla Foundation Security Advisory 2025-83
CVE: CVE-2025-11711
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.4
Mozilla
Mozilla Foundation Security Advisory 2025-82: CVE-2025-11711
vendor_mozilla·CVSS 6.5
CVE-2025-11711 [MEDIUM] Mozilla Foundation Security Advisory 2025-82: CVE-2025-11711
Mozilla Foundation Security Advisory 2025-82
CVE: CVE-2025-11711
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.29
Mozilla
Mozilla Foundation Security Advisory 2025-81: CVE-2025-11711
vendor_mozilla·CVSS 6.5
CVE-2025-11711 [MEDIUM] Mozilla Foundation Security Advisory 2025-81: CVE-2025-11711
Mozilla Foundation Security Advisory 2025-81
CVE: CVE-2025-11711
Product: Firefox
Impact: high
Fixed in: Firefox 144
GHSA
GHSA-xp5g-gff9-qvvx: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable
ghsa_unreviewed·2025-10-14
CVE-2025-11711 [MEDIUM] CWE-591 GHSA-xp5g-gff9-qvvx: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability affects Firefox < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
OSV
CVE-2025-11711: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable
osv·2025-10-14·CVSS 6.5
CVE-2025-11711 [MEDIUM] CVE-2025-11711: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable
There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability affects Firefox < 144, Firefox ESR < 115.29, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1989978https://www.mozilla.org/security/advisories/mfsa2025-81/https://www.mozilla.org/security/advisories/mfsa2025-82/https://www.mozilla.org/security/advisories/mfsa2025-83/https://www.mozilla.org/security/advisories/mfsa2025-84/https://www.mozilla.org/security/advisories/mfsa2025-85/https://lists.debian.org/debian-lts-announce/2025/10/msg00015.htmlhttps://lists.debian.org/debian-lts-announce/2025/10/msg00031.html
2025-10-14
Published