Contao: Server-Side Request Forgery (SSRF) via Unvalidated RSS Feed URL in Feed Reader Module

{
  "id": "f7b2cad1bd886c38e75145c3f104ad07f17eae2cda1eb66311f009349fd6d750",
  "url": "https://osv.dev/vulnerability/CVE-2026-57232",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Contao: Server-Side Request Forgery (SSRF) via Unvalidated RSS Feed URL in Feed Reader Module",
    "summary": "Contao is an Open Source CMS. From 5.3.35 through 5.3.47 and from 5.7.0-RC1 through 5.7.8, the Feed Reader front-end module passes configured RSS feed URLs from FeedReaderController::getResponse() to feedIo->read() without scheme or private-address validation, allowing a backend user with module-edit permissions to make the server request internal network services, loopback addresses, or cloud metadata endpoints. In core-bundle/src/Controller/FrontendModule/FeedReaderController.php, the getResponse() function iterates over the configured feed URLs and passes each one directly to the HTTP client (via $this->feedIo->read($url, new Feed())) with no validation, while the DCA field definition for rss_feed in tl_module.php carries no URL scheme or host validation and the HTTP client is wired as @psr18.http_client (Symfony HttpClient) with no SSRF protection configured, since NoPrivateNetworkHttpClient is not used. This issue is fixed in versions 5.3.48.",
    "evidence": "osv:CVE-2026-57232",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-57232",
      "aliases": [
        "CVE-2026-57232",
        "GHSA-87mg-5grr-rhwh"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/contao/contao",
              "type": "GIT",
              "events": [
                {
                  "introduced": "076a011a04cfee96a4873e1612a1faed4d82e903"
                },
                {
                  "fixed": "768c1aba602d0da99a17f7ae912f50cc0e362bb2"
                },
                {
                  "introduced": "fd7b39f3470004fa2574fb750343030c6043826d"
                },
                {
                  "fixed": "a42d0ad26c638f7d0a8a52a261a2b9049be1981e"
                },
                {
                  "fixed": "27f6201809553bee767dcef15535bb8f0f4eac5f"
                },
                {
                  "fixed": "53b939ff2c4718e3a1d7c54ddd8886e9370618e4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.7.0-RC1"
                      },
                      {
                        "fixed": "5.7.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "5.3.35"
                      },
                      {
                        "fixed": "5.3.48"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "27f6201809553bee767dcef15535bb8f0f4eac5f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "53b939ff2c4718e3a1d7c54ddd8886e9370618e4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.7.8",
            "5.7.7",
            "5.3.47",
            "5.7.6",
            "5.7.5",
            "5.3.46",
            "5.7.4",
            "5.7.3",
            "5.3.45",
            "5.7.2",
            "5.7.1",
            "5.7.0",
            "5.7.0-RC4",
            "5.7.0-RC3",
            "5.7.0-RC2",
            "5.7.0-RC1",
            "5.3.44",
            "5.3.43",
            "5.3.42",
            "5.3.41",
            "5.3.40",
            "5.3.39",
            "5.3.38",
            "5.3.37",
            "5.3.36",
            "5.3.35"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57232.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.061968898Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57232.json",
        "https://github.com/contao/contao/security/advisories/GHSA-87mg-5grr-rhwh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-57232",
        "https://github.com/contao/contao/commit/27f6201809553bee767dcef15535bb8f0f4eac5f",
        "https://github.com/contao/contao/commit/53b939ff2c4718e3a1d7c54ddd8886e9370618e4"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57232.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57232",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517500,
  "published_at": "2026-07-31T18:29:53.924+00:00"
}