Same-origin policy bypass in the Request Handling component
Published Dec 9, 2025
6.5
MEDIUMCVSS 3.1
EPSS 0.19%
Description
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 products
No data.
- < 115.31.0
- < 146.0
- ≥ 116.0 · < 140.6.0
- < 140.6.0
- < 146.0
No data.
Red Hat Enterprise Linux 10
firefox-0:140.6.0-1.el10_1
Fixed · RHSA-2025:23035
Red Hat Enterprise Linux 10
thunderbird-0:140.6.0-1.el10_1
Fixed · RHSA-2026:0025
Red Hat Enterprise Linux 10.0 Extended Update Support
firefox-0:140.6.0-1.el10_0
Fixed · RHSA-2026:0127
Red Hat Enterprise Linux 10.0 Extended Update Support
thunderbird-0:140.6.0-1.el10_0
Fixed · RHSA-2026:0124
Red Hat Enterprise Linux 7 Extended Lifecycle Support
firefox-0:140.6.0-1.el7_9
Fixed · RHSA-2026:0007
Red Hat Enterprise Linux 8
firefox-0:140.6.0-1.el8_10
Fixed · RHSA-2025:23128
Red Hat Enterprise Linux 8
thunderbird-0:140.6.0-1.el8_10
Fixed · RHSA-2026:0026
Red Hat Enterprise Linux 8.2 Advanced Update Support
firefox-0:140.6.0-1.el8_2
Fixed · RHSA-2026:0005
Red Hat Enterprise Linux 8.2 Advanced Update Support
thunderbird-0:140.6.0-1.el8_2
Fixed · RHSA-2026:0024
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
firefox-0:140.6.0-2.el8_4
Fixed · RHSA-2026:0006
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
thunderbird-0:140.6.0-1.el8_4
Fixed · RHSA-2026:0023
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
firefox-0:140.6.0-2.el8_4
Fixed · RHSA-2026:0006
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
thunderbird-0:140.6.0-1.el8_4
Fixed · RHSA-2026:0023
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
firefox-0:140.6.0-2.el8_6
Fixed · RHSA-2026:0014
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
thunderbird-0:140.6.0-1.el8_6
Fixed · RHSA-2026:0022
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
firefox-0:140.6.0-2.el8_6
Fixed · RHSA-2026:0014
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
thunderbird-0:140.6.0-1.el8_6
Fixed · RHSA-2026:0022
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
firefox-0:140.6.0-2.el8_6
Fixed · RHSA-2026:0014
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
thunderbird-0:140.6.0-1.el8_6
Fixed · RHSA-2026:0022
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
firefox-0:140.6.0-2.el8_8
Fixed · RHSA-2026:0015
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
thunderbird-0:140.6.0-1.el8_8
Fixed · RHSA-2026:0021
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
firefox-0:140.6.0-2.el8_8
Fixed · RHSA-2026:0015
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
thunderbird-0:140.6.0-1.el8_8
Fixed · RHSA-2026:0021
Red Hat Enterprise Linux 9
firefox-0:140.6.0-1.el9_7
Fixed · RHSA-2025:23034
Red Hat Enterprise Linux 9
thunderbird-0:140.6.0-1.el9_7
Fixed · RHSA-2025:23856
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
firefox-0:140.6.0-1.el9_0
Fixed · RHSA-2026:0018
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
thunderbird-0:140.6.0-1.el9_0
Fixed · RHSA-2026:0020
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
firefox-0:140.6.0-1.el9_2
Fixed · RHSA-2026:0017
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
thunderbird-0:140.6.0-1.el9_2
Fixed · RHSA-2026:0019
Red Hat Enterprise Linux 9.4 Extended Update Support
firefox-0:140.6.0-1.el9_4
Fixed · RHSA-2026:0016
Red Hat Enterprise Linux 9.4 Extended Update Support
thunderbird-0:140.6.0-1.el9_4
Fixed · RHSA-2026:0004
Red Hat Enterprise Linux 9.6 Extended Update Support
firefox-0:140.6.0-2.el9_6
Fixed · RHSA-2026:0013
Red Hat Enterprise Linux 9.6 Extended Update Support
thunderbird-0:140.6.0-1.el9_6
Fixed · RHSA-2026:0003
Red Hat Enterprise Linux 10
rhel10/firefox-flatpak
Affected
Red Hat Enterprise Linux 10
rhel10/thunderbird-flatpak
Affected
Red Hat Enterprise Linux 6
firefox
Out of support scope
Red Hat Enterprise Linux 6
thunderbird
Out of support scope
Red Hat Enterprise Linux 7
thunderbird
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | firefox-0:140.6.0-1.el10_1 | Fixed | RHSA-2025:23035 |
| Red Hat Enterprise Linux 10 | thunderbird-0:140.6.0-1.el10_1 | Fixed | RHSA-2026:0025 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | firefox-0:140.6.0-1.el10_0 | Fixed | RHSA-2026:0127 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | thunderbird-0:140.6.0-1.el10_0 | Fixed | RHSA-2026:0124 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | firefox-0:140.6.0-1.el7_9 | Fixed | RHSA-2026:0007 |
| Red Hat Enterprise Linux 8 | firefox-0:140.6.0-1.el8_10 | Fixed | RHSA-2025:23128 |
| Red Hat Enterprise Linux 8 | thunderbird-0:140.6.0-1.el8_10 | Fixed | RHSA-2026:0026 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | firefox-0:140.6.0-1.el8_2 | Fixed | RHSA-2026:0005 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | thunderbird-0:140.6.0-1.el8_2 | Fixed | RHSA-2026:0024 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | firefox-0:140.6.0-2.el8_4 | Fixed | RHSA-2026:0006 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | thunderbird-0:140.6.0-1.el8_4 | Fixed | RHSA-2026:0023 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | firefox-0:140.6.0-2.el8_4 | Fixed | RHSA-2026:0006 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | thunderbird-0:140.6.0-1.el8_4 | Fixed | RHSA-2026:0023 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | firefox-0:140.6.0-2.el8_6 | Fixed | RHSA-2026:0014 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | thunderbird-0:140.6.0-1.el8_6 | Fixed | RHSA-2026:0022 |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | firefox-0:140.6.0-2.el8_6 | Fixed | RHSA-2026:0014 |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | thunderbird-0:140.6.0-1.el8_6 | Fixed | RHSA-2026:0022 |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | firefox-0:140.6.0-2.el8_6 | Fixed | RHSA-2026:0014 |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | thunderbird-0:140.6.0-1.el8_6 | Fixed | RHSA-2026:0022 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | firefox-0:140.6.0-2.el8_8 | Fixed | RHSA-2026:0015 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | thunderbird-0:140.6.0-1.el8_8 | Fixed | RHSA-2026:0021 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | firefox-0:140.6.0-2.el8_8 | Fixed | RHSA-2026:0015 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | thunderbird-0:140.6.0-1.el8_8 | Fixed | RHSA-2026:0021 |
| Red Hat Enterprise Linux 9 | firefox-0:140.6.0-1.el9_7 | Fixed | RHSA-2025:23034 |
| Red Hat Enterprise Linux 9 | thunderbird-0:140.6.0-1.el9_7 | Fixed | RHSA-2025:23856 |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | firefox-0:140.6.0-1.el9_0 | Fixed | RHSA-2026:0018 |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | thunderbird-0:140.6.0-1.el9_0 | Fixed | RHSA-2026:0020 |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | firefox-0:140.6.0-1.el9_2 | Fixed | RHSA-2026:0017 |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | thunderbird-0:140.6.0-1.el9_2 | Fixed | RHSA-2026:0019 |
| Red Hat Enterprise Linux 9.4 Extended Update Support | firefox-0:140.6.0-1.el9_4 | Fixed | RHSA-2026:0016 |
| Red Hat Enterprise Linux 9.4 Extended Update Support | thunderbird-0:140.6.0-1.el9_4 | Fixed | RHSA-2026:0004 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | firefox-0:140.6.0-2.el9_6 | Fixed | RHSA-2026:0013 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | thunderbird-0:140.6.0-1.el9_6 | Fixed | RHSA-2026:0003 |
| Red Hat Enterprise Linux 10 | rhel10/firefox-flatpak | Affected | n/a |
| Red Hat Enterprise Linux 10 | rhel10/thunderbird-flatpak | Affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
1 other source (Red Hat) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Dec 9, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.19% (0.00187) | 7.49th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.16% (0.00156) | 5.06th | v5 (v2026.06.15) |
| Dec 10, 2025 | 0.01% (0.00015) | 2.11th | v4 (v2025.03.14) |
References (11)
- https://access.redhat.com/security/cve/CVE-2025-14331 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2000218 Issue TrackingPermissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=2420512 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2025-14331
- https://www.cve.org/CVERecord?id=CVE-2025-14331
- https://www.mozilla.org/security/advisories/mfsa2025-92/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-93/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-94/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-94/#CVE-2025-14331
- https://www.mozilla.org/security/advisories/mfsa2025-95/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-96/ Vendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-14331 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=2000218 | Issue TrackingPermissions Required | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2420512 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2025-14331 | ||
| https://www.cve.org/CVERecord?id=CVE-2025-14331 | ||
| https://www.mozilla.org/security/advisories/mfsa2025-92/ | Vendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2025-93/ | Vendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2025-94/ | Vendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2025-94/#CVE-2025-14331 | ||
| https://www.mozilla.org/security/advisories/mfsa2025-95/ | Vendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2025-96/ | Vendor Advisory |
Change history (0)
No recorded changes yet.