Chamilo LMS: Student-to-admin stored XSS in private messages via v-html

{
  "id": "8af9947756e93db7c49738e00f427610c187f4b16dbc09a9f2256471f848bc77",
  "url": "https://osv.dev/vulnerability/CVE-2026-45143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Chamilo LMS: Student-to-admin stored XSS in private messages via v-html",
    "summary": "Chamilo LMS is an open-source learning management system. From 2.0.0 through at least 2.1.0, Chamilo LMS stores private Message.content without server-side sanitization and renders it as HTML in assets/vue/views/message/MessageShow.vue and public/main/template/default/message/view_message.html.twig. An authenticated low-privilege user, including a student, can directly address crafted message content to an administrator because the message creation flow permits a sender to select another user as the recipient. The content executes in the recipient's browser when the recipient opens the routine inbox or message view, without requiring a link click, and can expose session credentials or permit actions as the administrator. This vulnerability is fixed in 2.0.1.",
    "evidence": "osv:CVE-2026-45143",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-45143",
      "aliases": [
        "CVE-2026-45143",
        "GHSA-x88v-rg6r-vqq6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/chamilo/chamilo-lms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "592d4dfa24044c671690e1533f8ce9877011f0a7"
                },
                {
                  "fixed": "9fd68157031e0e65ffbb1779fe1b3803da7eb55b"
                },
                {
                  "fixed": "b2c91c021fc5ab7e91feb4927c4c676f77034ac5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.0.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b2c91c021fc5ab7e91feb4927c4c676f77034ac5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9fd68157031e0e65ffbb1779fe1b3803da7eb55b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.0.1"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45143.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.516156506Z",
      "provider": "osv",
      "references": [
        "https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45143.json",
        "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x88v-rg6r-vqq6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45143",
        "https://github.com/chamilo/chamilo-lms/commit/b2c91c021fc5ab7e91feb4927c4c676f77034ac5"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521272,
  "published_at": "2026-09-17T20:09:57.972+00:00"
}