Misskey vulnerability allows threat actors to impersonate and take over accounts on remote servers

CVE-2024-25636

What is CVE-2024-25636?

Misskey, an open source decentralized social media platform, is vulnerable to an issue with its handling of Activity Streams objects. Prior to version 2024.2.0, Misskey fails to verify that responses from remote servers include the correct Content-Type header for Activity Streams media types. This oversight allows a malicious actor to upload a manipulated Activity Streams document to a compromised remote server that permits user uploads. If the remote server meets specific conditions, a threat actor could leverage this flaw to impersonate legitimate users and potentially take control of accounts. This vulnerability underscores the importance of validating server responses, particularly in decentralized applications that leverage user-generated content.

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