« Volver al listado

CVE-2021-20786

Estado: ModificadaMedia (4.3)—

Cross-site request forgery (CSRF) vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to hijack the authentication of administrators via a specially crafted URL.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (3)

Groupsession — GroupsessionGroupsession — Groupsession BycloudGroupsession — Groupsession Zion

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-20786",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "Japan Total System Co.,Ltd.",
          "product": "GroupSession",
          "versions": [
            {
              "status": "affected",
              "version": "GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-07-30T14:15:14.813",
  "references": [
    {
      "url": "https://groupsession.jp/info/info-news/security202107",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN86026700/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://groupsession.jp/info/info-news/security202107",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN86026700/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cross-site request forgery (CSRF) vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to hijack the authentication of administrators via a specially crafted URL."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de tipo Cross-site request forgery (CSRF) en GroupSession (GroupSession Free edition desde versión 2.2.0 hasta versión anterior a ver5.1.0, GroupSession byCloud desde versión 3.0.3 hasta versión anterior a ver5.1.0, y GroupSession ZION desde versión 3.0.3 hasta versión anterior a ver5.1.0) permite a un atacante remoto secuestrar la autenticación de los administradores por medio de una URL especialmente diseñada"
    }
  ],
  "lastModified": "2026-06-17T03:34:27.077",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BCD711A0-12D3-4FC1-B1F3-084DD5D9721B",
              "versionEndExcluding": "5.1.0",
              "versionStartIncluding": "2.20"
            },
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession_bycloud:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "20139ED3-424E-49EB-9D6D-9EAA356C0D96",
              "versionEndExcluding": "5.1.0",
              "versionStartIncluding": "3.0.3"
            },
            {
              "criteria": "cpe:2.3:a:groupsession:groupsession_zion:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9F38C4EF-470B-4C54-B57F-7C99AB59BF73",
              "versionEndExcluding": "5.1.0",
              "versionStartIncluding": "3.0.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}