Session Fixation in Chamilo LMS

{
  "id": "a192d481f23cf61a36f487c28f6386915b8167c814d8acdc1806312ce5137386",
  "url": "https://osv.dev/vulnerability/CVE-2026-31940",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Session Fixation in Chamilo LMS",
    "summary": "Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, in main/lp/aicc_hacp.php, user-controlled request parameters are directly used to set the PHP session ID before loading global bootstrap. This leads to session fixation. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.",
    "evidence": "osv:CVE-2026-31940",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-31940",
      "aliases": [
        "CVE-2026-31940",
        "GHSA-4gp7-cfjh-77gv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/chamilo/chamilo-lms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "abb5547a46a96339dfe6079e9b7ecd329bca181a"
                },
                {
                  "fixed": "ce0192c62e48c9d9474d915c541b3274844afbf9"
                },
                {
                  "fixed": "e337b7cc74a0276a0b4f91f9282204d20cac1869"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.11.38"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ce0192c62e48c9d9474d915c541b3274844afbf9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e337b7cc74a0276a0b4f91f9282204d20cac1869"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.11.36",
            "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",
            "v1.11.32",
            "v1.11.30",
            "v1.11.30-rc.1",
            "v2.0.0-alpha.2",
            "v1.11.28",
            "v2.0.0-alpha.1",
            "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-2026-31940.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.155686670Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31940.json",
        "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-4gp7-cfjh-77gv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31940",
        "https://github.com/chamilo/chamilo-lms/commit/ce0192c62e48c9d9474d915c541b3274844afbf9",
        "https://github.com/chamilo/chamilo-lms/commit/e337b7cc74a0276a0b4f91f9282204d20cac1869"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-384"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31940.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31940",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489453,
  "published_at": "2026-04-10T17:35:10.661+00:00"
}