{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e1a8b158e04ad567d92d8daf3cc0898ee18f1a2e"
            }
          ],
          "repo": "https://github.com/misskey-dev/misskey",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "12.90.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4b48ba4e8cff670ce4726417fe9b176cda0c4e76"
            }
          ],
          "repo": "https://github.com/syuilo/misskey",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in \"Upload from URL\" and remote attachment handling. This could result in the disclosure of non-public information within the internal network. This has been fixed in 12.90.0. However, if you are using a proxy, you will need to take additional measures. As a workaround this exploit may be avoided by appropriately restricting access to private networks from the host where the application is running.",
  "id": "CVE-2021-39195",
  "modified": "2026-04-01T23:08:51.229938281Z",
  "published": "2021-09-07T19:15:08.600Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/misskey-dev/misskey/blob/develop/CHANGELOG.md#12900-20210904"
    },
    {
      "type": "FIX",
      "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vf"
    },
    {
      "type": "FIX",
      "url": "https://github.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2e"
    }
  ],
  "related": [
    "GHSA-mqv7-gxh4-r5vf"
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}