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When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can use this method to create a mailto URL that looks safe to users, but will actually attach files when clicked.

🗓️ 11 Feb 2025 08:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

Misparsing in xdg mail with Thunderbird for mailto leaks RFC 2368 headers, enabling attachments via crafted URLs.

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11 Feb 2025 08:00Current
7.4High risk
Vulners AI Score7.4
CVSS 3.17.4
EPSS0.00045
SSVC
1