Security advisory

{
  "id": "01b541642d58dd5ffb1fc8e738cd9903da4b313b04963347b80ba4feb5dade44",
  "url": "https://osv.dev/vulnerability/CVE-2023-28820",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-28820",
    "summary": "Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.",
    "evidence": "osv:CVE-2023-28820",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2023-28820",
      "aliases": [
        "CVE-2023-28820",
        "GHSA-fgxj-g7x3-85cq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/concretecms/concretecms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f1a0eb94bc70d74c58ec8746a7a940cf8257bf22"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "cpe": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.0.2",
            "9.0.1",
            "9.0.0",
            "8.5.5",
            "8.5.4",
            "8.5.3",
            "8.5.2",
            "8.5.1",
            "8.5.0",
            "8.4.5",
            "8.4.4",
            "8.4.3",
            "8.4.2",
            "8.4.1",
            "8.3.1",
            "8.2.1",
            "8.2.0",
            "8.2.0RC2",
            "8.1.0",
            "5.7.5.7",
            "5.7.5.6",
            "5.7.5.5",
            "5.7.5.2",
            "5.7.4.1",
            "5.7.3.1",
            "5.7.3",
            "5.7.2.1",
            "5.7.2",
            "5.7.0.4",
            "5.7.1",
            "5.7.0.3",
            "5.7.0.1",
            "5.7.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-28820.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.001827138Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28820.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-28820",
        "https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20",
        "https://github.com/concretecms/concretecms/releases"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28820.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-28820",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518332,
  "published_at": "2023-04-28T00:00:00+00:00"
}