Medium severity6.3NVD Advisory· Published Apr 15, 2025· Updated Apr 13, 2026
CVE-2025-3522
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 was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <128.9.2
- (no CPE)range: < 128.9.2 for Thunderbird 128.x, < 137.0.2 for Thunderbird 137.x
- osv-coords5 versionspkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6
< 128.9.2-1.el9_5.alma.1+ 4 more
- (no CPE)range: < 128.9.2-1.el9_5.alma.1
- (no CPE)range: < 128.9.2-150200.8.209.1
- (no CPE)range: < 128.9.2-1.1
- (no CPE)range: < 128.9.2-150200.8.209.1
- (no CPE)range: < 128.9.2-150200.8.209.1
Patches
Vulnerability mechanics
References
3- www.mozilla.org/security/advisories/mfsa2025-26/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-27/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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