CVE-2024-25636 Lack of media type verification of Activity Streams objects allows impersonation and takeover of remote accounts
Attackers can impersonate and take over remote accounts by uploading crafted Activity Streams documents to servers accepting arbitrary uploads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-25636?
CVE-2024-25636 is a high-severity vulnerability in misskey-dev misskey, published on 19 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Misskey is an open source, decentralized social media platform with ActivityPub support. Prior to version 2024.2.0, when fetching remote Activity Streams objects, Misskey doesn't check that the response from the remote server has a `Content-Type` header value of the Activity Streams media type, which allows a threat actor to upload a crafted Activity Streams document to a remote server and make a Misskey instance fetch it, if the remote server accepts arbitrary user uploads. The vulnerability allows a threat actor to impersonate and take over an account on a remote server that satisfies all of the following properties: allows the threat actor to register an account; accepts arbitrary user-uploaded documents and places them on the same domain as legitimate Activity Streams actors; and serves user-uploaded document in response to requests with an `Accept` header value of the Activity Streams media type. Version 2024.2.0 contains a patch for the issue.
Weakness: CWE-434
Which versions are affected by CVE-2024-25636?
It affects 1 product.
Products include Misskey Misskey.
How do I fix CVE-2024-25636?
No fix has been published for CVE-2024-25636 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-25636 being exploited?
There is no known exploitation of CVE-2024-25636 in the wild and no public exploit code.
Other vulnerabilities in misskey-dev misskey
- CVE-2025-25306 Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes
- CVE-2023-49079 Misskey's missing signature validation allows arbitrary users to impersonate any remote user.
- CVE-2026-28431 Misskey lacks proper authorization checks and input validation
- CVE-2023-52139 Misskey vulnerable to improper authorization when accessing with third-party application
- CVE-2024-52590 Missing validation allows spoofed profiles in Misskey
Sources
Also known as GHSA-qqrm-9grj-6v32.