Reflected Cross-Site Scripting (XSS) vulnerability in Alkacon's OpenCms

{
  "id": "73d1c65b67ab97b9ac0680a377abba9a92f9077a4f69531a70edcce21ed00d48",
  "url": "https://osv.dev/vulnerability/CVE-2026-2736",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Reflected Cross-Site Scripting (XSS) vulnerability in Alkacon's OpenCms",
    "summary": "Reflected Cross-site Scripting (XSS) in Alkacon's OpenCms v18.0, which allows an attacker to execute JavaScript code in the victim's browser by sending the victim a malicious URL containing the ‘q’ parameter in ‘/search/index.html’. This vulnerability can be exploited to steal sensitive user information such as session cookies, or to perform actions while impersonating the user.",
    "evidence": "osv:CVE-2026-2736",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-2736",
      "aliases": [
        "CVE-2026-2736"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/alkacon/opencms-core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b6fe78b972f1dabb9cb06e800b4e8fe278741c8d"
                },
                {
                  "last_affected": "b6fe78b972f1dabb9cb06e800b4e8fe278741c8d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:alkacon:opencms:18.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "18.0.0"
                      },
                      {
                        "last_affected": "18.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "18.0.0",
            "build_18_0_0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2736.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.490435313Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2736.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-2736",
        "https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacons-opencms"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "INCIBE",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "18.0"
                  },
                  {
                    "last_affected": "18.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2736.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-2736",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507214,
  "published_at": "2026-02-19T08:39:46.15+00:00"
}