CVE-2024-51749: Element's thumbnails can be abused to misrepresent the content of an attachment

First published: Tue Nov 12 2024(Updated: )

Element is a Matrix web client built using the Matrix React SDK. Versions of Element Web and Desktop earlier than 1.11.85 do not check if thumbnails for attachments, stickers and images are coherent. It is possible to add thumbnails to events trigger a file download once clicked. Fixed in element-web 1.11.85.

Credit: security-advisories@github.com

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