CVE-2025-3522

Name
CVE-2025-3522
Description
Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security@mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-26/
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-27/

Match rules

CPE URI Source package Min version Max version
thunderbird >= unspecified < 137.0.2
thunderbird >= unspecified < 128.9.2
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* thunderbird >= None < 128.9.2
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* thunderbird >= 129.0 < 137.0.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
thunderbird edge-community 128.5.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.6.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.8.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird 3.22-community 128.11.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable