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Thunderbird CVE-2025-10529

MEDIUM
Permissive Cross-domain Security Policy with Untrusted Domains (CWE-942)
2025-09-16 security@mozilla.org
Authentication Bypass Mozilla Cors Misconfiguration Thunderbird
6.5
CVSS 3.1 · Vendor: mozilla
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Vulnerability Assessment

Weakness
CWE
CWE-942
OWASP Top 10:2025
A02:2025 - Security Misconfiguration
ASVS 5.0
V13 - Configuration CORS policy restriction
Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.06%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Same-origin policy bypass in the Layout component. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-942. Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (mozilla) PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SUSE MEDIUM
Red Hat 6.1 MEDIUM

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch released
Apr 04, 2026 - 20:30 nvd
Patch available
CVE Published
Sep 16, 2025 - 13:15 nvd
MEDIUM 6.5

DescriptionCVE.org

Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.

Executive ViewAI

Why It Matters

Organizations using policy bypass in the Layout component. This vulnerability affects Firefox should be aware of notable risk from CVE-2025-10529 rated CVSS 6.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.1%
Top 83% exploitable
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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Same weakness CWE-942 – Permissive Cross-domain Security Policy with Untrusted Domains

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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:latest Container suse/sl-micro/6.0/base-os-container:latest Container suse/sl-micro/6.0/kvm-os-container:latest Container suse/sl-micro/6.0/rt-os-container:latest Container suse/sl-micro/6.1/baremetal-os-container:2.2.0-4.10 Container suse/sl-micro/6.1/base-os-container:2.2.0-4.9 Container suse/sl-micro/6.1/kvm-os-container:2.2.0-4.8 Container suse/sl-micro/6.1/rt-os-container:2.2.0-4.9 Affected
Container suse/sl-micro/6.0/toolbox:latest Affected
Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2025:16108 ADVISORY https://access.redhat.com/errata/RHSA-2025:16109 ADVISORY https://access.redhat.com/errata/RHSA-2025:16156 ADVISORY https://access.redhat.com/errata/RHSA-2025:16157 ADVISORY https://access.redhat.com/errata/RHSA-2025:16260 ADVISORY https://access.redhat.com/errata/RHSA-2025:16589 ADVISORY https://access.redhat.com/errata/RHSA-2025:17340 ADVISORY https://access.redhat.com/errata/RHSA-2025:17341 ADVISORY https://access.redhat.com/errata/RHSA-2025:17342 ADVISORY https://access.redhat.com/errata/RHSA-2025:17343 ADVISORY https://access.redhat.com/errata/RHSA-2025:17344 ADVISORY https://access.redhat.com/errata/RHSA-2025:17345 ADVISORY https://access.redhat.com/errata/RHSA-2025:17346 ADVISORY https://access.redhat.com/errata/RHSA-2025:17367 ADVISORY https://access.redhat.com/errata/RHSA-2025:17368 ADVISORY https://access.redhat.com/errata/RHSA-2025:17371 ADVISORY https://access.redhat.com/errata/RHSA-2025:17372 ADVISORY https://access.redhat.com/errata/RHSA-2025:17373 ADVISORY https://access.redhat.com/errata/RHSA-2025:17374 ADVISORY https://access.redhat.com/errata/RHSA-2025:17378 ADVISORY https://access.redhat.com/errata/RHSA-2025:17453 ADVISORY https://vuldb.com/vuln/324463 ADVISORY https://www.mozilla.org/security/advisories/mfsa2025-73/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2025-75/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2025-77/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2025-78/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:03291/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:03309/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21021/ REF https://bugzilla.mozilla.org/show_bug.cgi?id=1970490 REF https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html REF https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html

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