Fediverse Embeds: Unauthenticated SSRF / open proxy via REST media-proxy endpoint

{
  "id": "3a13a510e6bc359e17b9e079a4a9115a7c6aae51fffe0acfeef7fb97152741e9",
  "url": "https://osv.dev/vulnerability/CVE-2026-46697",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fediverse Embeds: Unauthenticated SSRF / open proxy via REST media-proxy endpoint",
    "summary": "Fediverse Embeds embeds fediverse posts on WordPress sites. Prior to version 1.5.8, Fediverse Embeds registered an unauthenticated REST route ftf/media-proxy (includes/Media_Proxy.php) with permission_callback => __return_true that accepted a base64-encoded URL and forwarded it to wp_remote_get($url) without enforcing any allowlist. The plugin's source contained a comment block explicitly acknowledging that the request should be validated against allowed fediverse domains, but in 1.5.7 the validation only set a local $can_download_media flag that was never read. The full response body was echoed back to the caller, so this was a full-read SSRF / open proxy reachable by any anonymous visitor. This issue has been patched in version 1.5.8.",
    "evidence": "osv:CVE-2026-46697",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-46697",
      "aliases": [
        "CVE-2026-46697",
        "GHSA-mpq6-hjh3-m543"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stefanbohacek/fediverse-embeds-wordpress-plugin",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2f021faf4dadaccef67eda7b81a0b7ceaef450df"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "2f021faf4dadaccef67eda7b81a0b7ceaef450df"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46697.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.339868925Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46697.json",
        "https://github.com/stefanbohacek/fediverse-embeds-wordpress-plugin/security/advisories/GHSA-mpq6-hjh3-m543",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46697",
        "https://github.com/stefanbohacek/fediverse-embeds-wordpress-plugin/commit/2f021faf4dadaccef67eda7b81a0b7ceaef450df"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.5.8"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.5.8"
                  },
                  {
                    "fixed": "1.5.8"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46697.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46697",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509034,
  "published_at": "2026-06-11T17:16:03.883+00:00"
}