Chamilo LMS has Reflected XSS via Unsanitized http_build_query() in Exercise Question List Pagination

{
  "id": "f108051a6883c953eee841ee64dab0a318c1433594d1d9ea98be0266c3ed9521",
  "url": "https://osv.dev/vulnerability/CVE-2026-32893",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Chamilo LMS has Reflected XSS via Unsanitized http_build_query() in Exercise Question List Pagination",
    "summary": "Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, a Reflected Cross-Site Scripting (XSS) vulnerability in the exercise question list admin panel allows an attacker to execute arbitrary JavaScript in an authenticated teacher's browser. The pagination code merges all $_GET parameters via array_merge() and outputs the result via http_build_query() directly into HTML href attributes without htmlspecialchars() encoding. This vulnerability is fixed in 2.0.0-RC.3.",
    "evidence": "osv:CVE-2026-32893",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-32893",
      "aliases": [
        "CVE-2026-32893",
        "GHSA-37jh-g64j-88mc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/chamilo/chamilo-lms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7dacdc0bbed7f5d2c6d000c2c062bd4eaa48332b"
                },
                {
                  "fixed": "612fdb12acbbff9f956a412d0af76e488d3419d6"
                },
                {
                  "fixed": "72bc403f89b1ebb73a139f8f6cf0478857592276"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0-alpha.1"
                      },
                      {
                        "fixed": "2.0.0-RC.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "72bc403f89b1ebb73a139f8f6cf0478857592276"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.0.0-RC.2",
            "v2.0.0-RC.1",
            "v2.0.0-beta.3",
            "v2.0.0-beta.1",
            "v2.0.0-alpha.5",
            "v2.0.0-alpha.4",
            "v2.0.0-alpha.3",
            "v2.0.0-alpha.2",
            "v2.0.0-alpha.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32893.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.207292421Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32893.json",
        "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-37jh-g64j-88mc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-32893",
        "https://github.com/chamilo/chamilo-lms/commit/72bc403f89b1ebb73a139f8f6cf0478857592276"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32893.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-32893",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510906,
  "published_at": "2026-04-10T17:42:24.22+00:00"
}