FKIE_CVE-2026-33710

Vulnerability from fkie_nvd - Published: 2026-04-10 19:16 - Updated: 2026-10-26 21:10
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, REST API keys are generated using md5(time() + (user_id * 5) - rand(10000, 10000)). The rand(10000, 10000) call always returns exactly 10000 (min == max), making the formula effectively md5(timestamp + user_id*5 - 10000). An attacker who knows a username and approximate key creation time can brute-force the API key. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.
References
security-advisories@github.comhttps://github.com/chamilo/chamilo-lms/commit/4448701bb8ec557e94ef02d19c72cbe9c49c2d09Patch
security-advisories@github.comhttps://github.com/chamilo/chamilo-lms/commit/e7400dd840586ae134b286d0a2374f3d269a9a9dPatch
security-advisories@github.comhttps://github.com/chamilo/chamilo-lms/security/advisories/GHSA-rpmg-j327-mr39Vendor Advisory
Impacted products
Vendor Product Version
chamilo chamilo_lms *
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
chamilo chamilo_lms 2.0.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "chamilo-lms",
          "vendor": "chamilo",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.11.38"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0-alpha.1, \u003c 2.0.0-RC.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A4D0C5D2-6FA0-4532-8E3D-4EA111A50621",
              "versionEndExcluding": "1.11.38",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha1:*:*:*:*:*:*",
              "matchCriteriaId": "4AF7661F-C1F7-4CAB-BBDF-FC5BF7F5BEB8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha2:*:*:*:*:*:*",
              "matchCriteriaId": "FE56AF71-9D53-42C6-980D-09E1C418ED87",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha3:*:*:*:*:*:*",
              "matchCriteriaId": "01195674-9E1A-4C07-B7D3-0F0CC2E6511B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha4:*:*:*:*:*:*",
              "matchCriteriaId": "BAE63449-5A56-4302-A4BF-F3D19FC96A80",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha5:*:*:*:*:*:*",
              "matchCriteriaId": "A84A06F9-5AB7-4703-8153-33AC68882B95",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta1:*:*:*:*:*:*",
              "matchCriteriaId": "B91302A3-53DE-4ED0-BAAB-FE9DA03F8242",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta2:*:*:*:*:*:*",
              "matchCriteriaId": "46008D4A-96F7-4E04-8256-E115AAAE3383",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta3:*:*:*:*:*:*",
              "matchCriteriaId": "6E2BCAFF-D44B-4E67-998A-DF855E27606B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "D2E7D018-E4C2-45F5-8D9A-DAC947173607",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "DAF96697-6B6D-459D-9510-E5CEEDC2859B",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, REST API keys are generated using md5(time() + (user_id * 5) - rand(10000, 10000)). The rand(10000, 10000) call always returns exactly 10000 (min == max), making the formula effectively md5(timestamp + user_id*5 - 10000). An attacker who knows a username and approximate key creation time can brute-force the API key. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3."
    },
    {
      "lang": "es",
      "value": "Chamilo LMS es un sistema de gesti\u00f3n del aprendizaje. Antes de 1.11.38 y 2.0.0-RC.3, las claves de API REST se generan utilizando md5(time() + (user_id * 5) - rand(10000, 10000)). La llamada a rand(10000, 10000) siempre devuelve exactamente 10000 (m\u00edn == m\u00e1x), haciendo que la f\u00f3rmula sea efectivamente md5(timestamp + user_id5 - 10000). Un atacante que conoce un nombre de usuario y el tiempo aproximado de creaci\u00f3n de la clave puede forzar por fuerza bruta la clave de API. Esta vulnerabilidad est\u00e1 corregida en 1.11.38 y 2.0.0-RC.3."
    }
  ],
  "id": "CVE-2026-33710",
  "lastModified": "2026-10-26T21:10:00.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-33710",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-13T12:51:59.204900Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-10T19:16:24.257",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/chamilo/chamilo-lms/commit/4448701bb8ec557e94ef02d19c72cbe9c49c2d09"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/chamilo/chamilo-lms/commit/e7400dd840586ae134b286d0a2374f3d269a9a9d"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-rpmg-j327-mr39"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-330"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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