CVE-2025-14331
published 2025-12-09CVE-2025-14331: Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird…
PriorityP434medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
EPSS
0.16%
5.8th percentile
Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| debian | firefox-esr | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| debian | thunderbird | < firefox 146.0-1 (sid) | firefox 146.0-1 (sid) |
| mozilla | firefox | < 115.31.0 | 115.31.0 |
| mozilla | firefox | < 146.0 | 146.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.6.0 | 140.6.0 |
| mozilla | thunderbird | < 140.6.0 | 140.6.0 |
| mozilla | thunderbird | < 146.0 | 146.0 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb11u1 | 1:140.6.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb12u1 | 1:140.6.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1~deb13u1 | 1:140.6.0esr-1~deb13u1 |
| mozilla | thunderbird | >= 0 < 1:140.6.0esr-1 | 1:140.6.0esr-1 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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
firefox: thunderbird: Same-origin policy bypass in the Request Handling component
vendor_redhat·2025-12-09·CVSS 6.5
CVE-2025-14331 [MEDIUM] firefox: thunderbird: Same-origin policy bypass in the Request Handling component
firefox: thunderbird: Same-origin policy bypass in the Request Handling component
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Same-origin policy bypass in the Request Handling component.
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 Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support sc
Debian
CVE-2025-14331: firefox - Same-origin policy bypass in the Request Handling component. This vulnerability ...
vendor_debian·2025·CVSS 6.5
CVE-2025-14331 [MEDIUM] CVE-2025-14331: firefox - Same-origin policy bypass in the Request Handling component. This vulnerability ...
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
Scope: local
sid: resolved (fixed in 146.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-95: CVE-2025-14331
vendor_mozilla·CVSS 6.5
CVE-2025-14331 [MEDIUM] Mozilla Foundation Security Advisory 2025-95: CVE-2025-14331
Mozilla Foundation Security Advisory 2025-95
CVE: CVE-2025-14331
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 146
Mozilla
Mozilla Foundation Security Advisory 2025-92: CVE-2025-14331
vendor_mozilla·CVSS 6.5
CVE-2025-14331 [MEDIUM] Mozilla Foundation Security Advisory 2025-92: CVE-2025-14331
Mozilla Foundation Security Advisory 2025-92
CVE: CVE-2025-14331
Product: Firefox
Impact: moderate
Fixed in: Firefox 146
Mozilla
Mozilla Foundation Security Advisory 2025-93: CVE-2025-14331
vendor_mozilla·CVSS 6.5
CVE-2025-14331 [MEDIUM] Mozilla Foundation Security Advisory 2025-93: CVE-2025-14331
Mozilla Foundation Security Advisory 2025-93
CVE: CVE-2025-14331
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 115.31
Mozilla
Mozilla Foundation Security Advisory 2025-94: CVE-2025-14331
vendor_mozilla·CVSS 6.5
CVE-2025-14331 [MEDIUM] Mozilla Foundation Security Advisory 2025-94: CVE-2025-14331
Mozilla Foundation Security Advisory 2025-94
CVE: CVE-2025-14331
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.6
Mozilla
Mozilla Foundation Security Advisory 2025-96: CVE-2025-14331
vendor_mozilla·CVSS 6.5
CVE-2025-14331 [MEDIUM] Mozilla Foundation Security Advisory 2025-96: CVE-2025-14331
Mozilla Foundation Security Advisory 2025-96
CVE: CVE-2025-14331
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.6
GHSA
GHSA-pq76-9m6x-m6mx: Same-origin policy bypass in the Request Handling component
ghsa_unreviewed·2025-12-09
CVE-2025-14331 [MEDIUM] CWE-346 GHSA-pq76-9m6x-m6mx: Same-origin policy bypass in the Request Handling component
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.
OSV
CVE-2025-14331: Same-origin policy bypass in the Request Handling component
osv·2025-12-09·CVSS 6.5
CVE-2025-14331 [MEDIUM] CVE-2025-14331: Same-origin policy bypass in the Request Handling component
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2025-14331 firefox: thunderbird: Same-origin policy bypass in the Request Handling component
bugzilla·2025-12-09·CVSS 6.5
CVE-2025-14331 [MEDIUM] CVE-2025-14331 firefox: thunderbird: Same-origin policy bypass in the Request Handling component
CVE-2025-14331 firefox: thunderbird: Same-origin policy bypass in the Request Handling component
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10
Via RHSA-2025:23035 https://access.redhat.com/errata/RHSA-2025:23035
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2025:23034 https://access.redhat.com/errata/RHSA-2025:23034
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2025:23128 https://access.redhat.com/errata/RHSA-2025:23128
---
This issue has been addressed in the following product
Wiz
CVE-2025-14331 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2025-14331 [MEDIUM] CVE-2025-14331 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-14331 :
NixOS vulnerability analysis and mitigation
Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird < 140.6.
Source : NVD
## 6.5
Score
Published December 9, 2025
Severity MEDIUM
CNA Score 6.5
Affected Technologies
NixOS
Mozilla Firefox
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 10.8
Exploitation Probability (EPSS) N/A
Affected packages and libraries
firefox
rhel10::thunderbird-flatpak.src
Sources
AlmaLinux 8 Severity HIGH Has Fix Added at: Dec 12, 2025
AlmaLinux 9 Severity HIGH Has Fix Added at: Dec 12, 2025
Debian 11, 12, 13, 14
https://bugzilla.mozilla.org/show_bug.cgi?id=2000218https://www.mozilla.org/security/advisories/mfsa2025-92/https://www.mozilla.org/security/advisories/mfsa2025-93/https://www.mozilla.org/security/advisories/mfsa2025-94/https://www.mozilla.org/security/advisories/mfsa2025-95/https://www.mozilla.org/security/advisories/mfsa2025-96/
2025-12-09
Published