Chamilo stored XSS via user registration leads to admin account takeover

{
  "id": "9bb73813420f4d3cf78eda914f6e07a3863497424470d9d8d06d0dc4a6a61f71",
  "url": "https://osv.dev/vulnerability/CVE-2026-39878",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Chamilo stored XSS via user registration leads to admin account takeover",
    "summary": "Chamilo LMS versions 1.11.38 and earlier contain a stored cross-site scripting vulnerability in the user registration form that allows any unauthenticated attacker to execute arbitrary JavaScript in an administrator's browser session, leading to full platform admin account takeover. This has been patched in 1.11.40.",
    "evidence": "osv:CVE-2026-39878",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-39878",
      "aliases": [
        "CVE-2026-39878",
        "GHSA-gcjp-f7jm-rrrg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/chamilo/chamilo-lms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9f0ba7a833d2f7be511f6d5f32db6123f61e5857"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.11.40"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.11.38"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.11.38",
            "v1.11.36",
            "v1.11.32",
            "v1.11.30",
            "v1.11.30-rc.1",
            "v1.11.28",
            "v1.11.26",
            "v1.11.26-rc.1",
            "v1.11.24",
            "v1.11.22",
            "v1.11.22-beta.2",
            "v1.11.22-beta.1",
            "v1.11.20-beta.1",
            "v1.11.20",
            "v1.11.18",
            "v1.11.14",
            "v1.11.14-beta.1",
            "v1.11.12",
            "v1.11.10",
            "v1.11.6",
            "v1.11.6-alpha.1",
            "v1.9.8",
            "CHAMILO_1_9_6_STABLE",
            "CHAMILO_1_9_6_RC_2",
            "CHAMILO_1_9_6_RC_1",
            "CHAMILO_1_9_4_STABLE",
            "CHAMILO_1_9_4_RC_1",
            "CHAMILO_1_9_4_ALPHA_1",
            "CHAMILO_1_9_2_STABLE_QUARTER",
            "CHAMILO_1_9_2_STABLE",
            "CHAMILO_1_9_0_STABLE_3",
            "CHAMILO_1_9_0_STABLE_2",
            "CHAMILO_1_9_0_RC_1",
            "CHAMILO_1_8_8_4_STABLE",
            "CHAMILO_1_9_0_ALPHA_4",
            "CHAMILO_1_9_0_ALPHA_2",
            "CHAMILO_1_9_0_ALPHA_1",
            "CHAMILO_1_9_0_PRE_ALPHA",
            "CHAMILO_1_8_8.3_STABLE_4",
            "CHAMILO_1_8_8_2_STABLE_2",
            "CHAMILO_1_8_8_2_STABLE",
            "CHAMILO_1_8_8_2_RC_1",
            "CHAMILO_1_8_8_BETA_2",
            "CHAMILO_1_8_8_BETA_1",
            "CHAMILO_1_8_8_ALPHA",
            "CHAMILO_1_8_7_STABLE_BIS",
            "CHAMILO_1_8_7_STABLE",
            "CHAMILO_1_8_7_RC2",
            "CHAMILO_1_8_7_RC_1",
            "CHAMILO_1_8_7_ALPHA_2",
            "CHAMILO_1_8_7_ALPHA_1",
            "v1.8.6.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39878.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.858806205Z",
      "provider": "osv",
      "references": [
        "https://vokecyber.com/research/cve-2026-39878-chamilo-lms-stored-xss",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39878.json",
        "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-gcjp-f7jm-rrrg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39878"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39878.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39878",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521838,
  "published_at": "2026-07-20T17:08:21.23+00:00"
}