GetSimple CMS: Stored Cross-Site Scripting (XSS) via the "title" parameter in admin/components.php

{
  "id": "fc0cebe6af9c6e1eef053db9faacb042bfcff9475d46d60f1f6090d2b4a8da42",
  "url": "https://osv.dev/vulnerability/CVE-2026-71542",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "GetSimple CMS: Stored Cross-Site Scripting (XSS) via the \"title\" parameter in admin/components.php",
    "summary": "GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. In versions 3.3.22 and prior, GetSimpleCMS-CE is vulnerable to stored Cross-Site Scripting (XSS) in the \"Theme to Components\" functionality (admin/components.php) via the title parameter. The stored title is rendered inside a double-quoted HTML attribute in the administrative interface through an output path that HTML-entity-decodes the value before printing it, without re-encoding for the attribute context. This allows persistent execution of arbitrary JavaScript in the admin panel. At time of publication, there are no publicly available patches.",
    "evidence": "osv:CVE-2026-71542",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-71542",
      "aliases": [
        "CVE-2026-71542",
        "GHSA-vqfh-838q-xfqh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getsimplecms-ce/getsimplecms-ce",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "5486c10c75111e93404413fea6408f53dbffd930"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.3.22"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.3.22"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.3.22",
            "v3.3.21",
            "v3.3.17",
            "v3.3.18.1",
            "v3.3.16"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71542.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.814882943Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71542.json",
        "https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-vqfh-838q-xfqh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-71542"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71542.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-71542",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518443,
  "published_at": "2026-10-01T19:40:04.001+00:00"
}