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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-63115",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-02T17:12:41.067713Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-02T18:09:53.602Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ActivityPub",
          "vendor": "TryGhost",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 1.2.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ActivityPub is a multi-tenant ActivityPub server for Ghost, built with Fedify. From 1.0.0 until 1.2.6, the `Undo` handler allows a remote federated server to cause the service to act on a `follow` or `repost` as though the activity came from a different account. This permits removal of an existing `follow` relationship or `repost` belonging to another account without that account\u0027s involvement. No private data is exposed and content is not modified; the affected relationships can be re-established. Services proxying to Ghost\u0027s hosted ActivityPub server have already been updated, while self-hosted services require an updated image and redeployment. This issue is fixed in version 1.2.6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T21:33:55.894Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/TryGhost/ActivityPub/security/advisories/GHSA-mm4q-93gr-5mwc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/TryGhost/ActivityPub/security/advisories/GHSA-mm4q-93gr-5mwc"
        },
        {
          "name": "https://github.com/TryGhost/ActivityPub/pull/1929",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TryGhost/ActivityPub/pull/1929"
        },
        {
          "name": "https://github.com/TryGhost/ActivityPub/commit/1526f540b983da97750b380868a210e6cdfb985e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TryGhost/ActivityPub/commit/1526f540b983da97750b380868a210e6cdfb985e"
        },
        {
          "name": "https://github.com/TryGhost/ActivityPub/releases/tag/v1.2.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TryGhost/ActivityPub/releases/tag/v1.2.6"
        }
      ],
      "source": {
        "advisory": "GHSA-mm4q-93gr-5mwc",
        "discovery": "UNKNOWN"
      },
      "title": "ActivityPub Undo handler can unfollow or remove reposts on behalf of other accounts"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63115",
    "datePublished": "2026-10-30T21:33:55.894Z",
    "dateReserved": "2026-07-15T16:54:55.816Z",
    "dateUpdated": "2026-11-02T18:09:53.602Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}