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A flaw was found in the xdg-email component of xdg-utils-1.1.0-rc1 and newer. When handling mailto: URIs, xdg-email allows attachments to be discreetly added via the URI when being passed to Thunderbird. An attacker could potentially send a victim a URI that automatically attaches a sensitive file to a new email. If a victim user does not notice that an attachment was added and sends the email, this could result in sensitive information disclosure. It has been confirmed that the code behind this issue is in xdg-email and not in Thunderbird.

🗓️ 02 Oct 2025 06:11:05Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

A flaw in xdg-email allows mailto URIs to attach files via Thunderbird, risking disclosure.

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02 Oct 2025 06:11Current
7High risk
Vulners AI Score7
CVSS 24.3
CVSS 3.16.5
EPSS0.01443
2