YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox

{
  "id": "b719d1c4cddb1ffd524489108b89b0584952565175d18be2fe9a87170d4d8e33",
  "url": "https://osv.dev/vulnerability/CVE-2026-104463",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox",
    "summary": "YesWiki before 4.6.7 contains a server-side request forgery vulnerability that allows unauthenticated attackers to trigger server requests by sending signed Follow activities to the public forms actor inbox route. Attackers sign requests with their own keyId while supplying internal actor URLs in the body, reaching internal hosts or cloud metadata via blind GET and POST requests.",
    "evidence": "osv:CVE-2026-104463",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-104463",
      "aliases": [
        "CVE-2026-104463",
        "GHSA-x623-wwf6-f6wp"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yeswiki/yeswiki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "07120ed8971047f504f7ec78060828f1895f475f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.6.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.6.7"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.6.6",
            "v4.6.5",
            "v4.6.4",
            "v4.6.3",
            "v4.6.2",
            "v4.6.0",
            "v4.5.5",
            "v4.5.4",
            "v4.5.3",
            "v4.5.2",
            "v4.5.1",
            "v4.4.3",
            "v4.4.2",
            "v4.4.1",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.5",
            "v4.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104463.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.159686290Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104463.json",
        "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-x623-wwf6-f6wp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104463",
        "https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-unauthenticated-ssrf-via-activitypub-inbox"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104463.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104463",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500440,
  "published_at": "2026-10-02T11:38:30.873+00:00"
}