CVE-2025-10531
published 2025-09-16CVE-2025-10531: Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
PriorityP425medium5.4CVSS 3.1
AVNACLPRNUIRSUCLILAN
EPSS
0.26%
17.0th percentile
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 143.0-1 (sid) | firefox 143.0-1 (sid) |
| mozilla | firefox | < 143.0 | 143.0 |
| mozilla | firefox | — | — |
| mozilla | thunderbird | < 143.0 | 143.0 |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
osv5.4MEDIUM
vendor_debian5.4MEDIUM
vendor_redhat5.4MEDIUM
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Red Hat
firefox: Mitigation bypass in the Web Compatibility: Tooling component
vendor_redhat·2025-09-16·CVSS 5.4
CVE-2025-10531 [MEDIUM] firefox: Mitigation bypass in the Web Compatibility: Tooling component
firefox: Mitigation bypass in the Web Compatibility: Tooling component
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:Mitigation bypass in the Web Compatibility: Tooling component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat Enterprise Linux 7) - Not affected
Package: firefox (Red Hat Enterprise Linux
Debian
CVE-2025-10531: firefox - Mitigation bypass in the Web Compatibility: Tooling component. This vulnerabilit...
vendor_debian·2025·CVSS 5.4
CVE-2025-10531 [MEDIUM] CVE-2025-10531: firefox - Mitigation bypass in the Web Compatibility: Tooling component. This vulnerabilit...
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
Scope: local
sid: resolved (fixed in 143.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-73: CVE-2025-10531
vendor_mozilla·CVSS 5.4
CVE-2025-10531 [MEDIUM] Mozilla Foundation Security Advisory 2025-73: CVE-2025-10531
Mozilla Foundation Security Advisory 2025-73
CVE: CVE-2025-10531
Product: Firefox
Impact: high
Fixed in: Firefox 143
Mozilla
Mozilla Foundation Security Advisory 2025-77: CVE-2025-10531
vendor_mozilla·CVSS 5.4
CVE-2025-10531 [MEDIUM] Mozilla Foundation Security Advisory 2025-77: CVE-2025-10531
Mozilla Foundation Security Advisory 2025-77
CVE: CVE-2025-10531
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 143
GHSA
GHSA-h6qg-7fq8-gw5h: This vulnerability affects Firefox < 143 and Thunderbird < 143
ghsa_unreviewed·2025-09-16
CVE-2025-10531 [MEDIUM] CWE-288 GHSA-h6qg-7fq8-gw5h: This vulnerability affects Firefox < 143 and Thunderbird < 143
This vulnerability affects Firefox < 143 and Thunderbird < 143.
OSV
CVE-2025-10531: Mitigation bypass in the Web Compatibility: Tooling component
osv·2025-09-16·CVSS 5.4
CVE-2025-10531 [MEDIUM] CVE-2025-10531: Mitigation bypass in the Web Compatibility: Tooling component
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
No detection rules found.
No public exploits indexed.
2025-09-16
Published