Mozilla Foundation Security Advisory 2025-31
Security Vulnerabilities fixed in Thunderbird 138
- Announced
- April 29, 2025
- Impact
- high
- Products
- Thunderbird
- Fixed in
-
- Thunderbird 138
#CVE-2025-2817: Privilege escalation in Thunderbird Updater
- Reporter
- Dong-uk Kim (@justlikebono)
- Impact
- high
Description
Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation.
References
#CVE-2025-4082: WebGL shader attribute memory corruption in Thunderbird for macOS
- Reporter
- un3xploitable & GF
- Impact
- high
Description
Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges.
This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.
References
#CVE-2025-4083: Process isolation bypass using "javascript:" URI links in cross-origin frames
- Reporter
- Nika Layzell
- Impact
- high
Description
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape.
References
#CVE-2025-4085: Potential information leakage and privilege escalation in UITour actor
- Reporter
- Andrew McCreight
- Impact
- moderate
Description
An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges.
References
#CVE-2025-4086: Specially crafted filename could be used to obscure download type
- Reporter
- Hafiizh
- Impact
- moderate
Description
A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog.
This bug only affects Thunderbird for Android. Other versions of Thunderbird are unaffected.
References
#CVE-2025-4087: Unsafe attribute access during XPath parsing
- Reporter
- Ivan Fratric
- Impact
- moderate
Description
A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption.
References
#CVE-2025-4088: Cross-site request forgery via storage access API redirects
- Reporter
- Chris P. Fredrickson
- Impact
- moderate
Description
A security vulnerability in Thunderbird allowed malicious sites to use redirects to send credentialed requests to arbitrary endpoints on any site that had invoked the Storage Access API. This enabled potential Cross-Site Request Forgery attacks across origins.
References
#CVE-2025-4089: Potential local code execution in "copy as cURL" command
- Reporter
- Ameen Basha M K
- Impact
- moderate
Description
Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system.
References
#CVE-2025-4090: Leaked library paths in Thunderbird for Android
- Reporter
- Seongyun Jeong
- Impact
- low
Description
A vulnerability existed in Thunderbird for Android where potentially sensitive library locations were logged via Logcat.
References
#CVE-2025-4091: Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
- Reporter
- Maurice Dauer and the Mozilla Fuzzing Team
- Impact
- moderate
Description
Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
References
#CVE-2025-4092: Memory safety bugs fixed in Firefox 138 and Thunderbird 138
- Reporter
- Randell Jesup, Jens Stutte, and the Mozilla Fuzzing Team
- Impact
- high
Description
Memory safety bugs present in Firefox 137 and Thunderbird 137. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.