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Lack of media type verification of Activity Streams objects allows impersonation and takeover of remote accounts

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2024-25636
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 09:10 UTC · Revision 1

Source evidence

Lack of media type verification of Activity Streams objects allows impersonation and takeover of remote accounts

core-osv · Original source

Published 19 Feb 2024, 19:42 UTC

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.

osv:CVE-2024-25636
Complete source record
{
  "id": "5ce44c2592439b93a00c1505c89ba468260bc6cd97bfba77e0298d8aa139d520",
  "url": "https://osv.dev/vulnerability/CVE-2024-25636",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Lack of media type verification of Activity Streams objects allows impersonation and takeover of remote accounts",
    "summary": "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.",
    "evidence": "osv:CVE-2024-25636",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-25636",
      "aliases": [
        "CVE-2024-25636",
        "GHSA-qqrm-9grj-6v32"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misskey-dev/misskey",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "96c7c85ad008a71fb03198a708c8531aacbb39e0"
                },
                {
                  "fixed": "9a70ce8f5ea9df00001894809f5ce7bc69b14c8a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2024.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9a70ce8f5ea9df00001894809f5ce7bc69b14c8a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-25636.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:47.160438852Z",
      "provider": "osv",
      "references": [
        "https://github.com/misskey-dev/misskey/blob/2024.2.0-beta.10/packages/backend/src/core/activitypub/ApResolverService.ts#L69-L119",
        "https://github.com/misskey-dev/misskey/blob/2024.2.0-beta.10/packages/backend/src/core/activitypub/models/ApNoteService.ts#L112-L308",
        "https://github.com/misskey-dev/misskey/blob/2024.2.0-beta.10/packages/backend/src/server/api/endpoints/ap/show.ts#L125-L143",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/25xxx/CVE-2024-25636.json",
        "https://github.com/misskey-dev/misskey/security/advisories/GHSA-qqrm-9grj-6v32",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-25636",
        "https://github.com/misskey-dev/misskey/commit/9a70ce8f5ea9df00001894809f5ce7bc69b14c8a"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        ],
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/25xxx/CVE-2024-25636.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2024-25636",
        "evidence": "/id"
      }
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 515059,
  "published_at": "2024-02-19T19:42:20.688+00:00"
}