CVSS 3.1 Score 8.5 of 10 (high)


Published Feb 19, 2024
Updated: Feb 20, 2024
CWE ID 434


CVE-2024-25623 is a vulnerability that affects Mastodon, a free and open-source social network server based on ActivityPub. Versions 4.2.7, 4.1.15, 4.0.15, and 3.5.19 of Mastodon are vulnerable to this issue. The vulnerability arises from the server not checking the Content-Type header value of the response when fetching remote statuses, allowing a threat actor to upload a crafted Activity Streams document to a remote server that accepts arbitrary user uploads. This can lead to impersonation of an account on the remote server by serving user-uploaded documents in response to requests with an Accept header value of the Activity Streams media type. The issue has been fixed in the mentioned versions, and organizations using vulnerable versions should update their Mastodon installation to ensure security against this threat.

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