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CVE-2021-20787

Estado: ModificadaMedia (4.8)—

Cross-site scripting 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 inject an arbitrary script by sending a specially crafted request to a specific 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-2021-20787",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 1.7
      }
    ]
  },
  "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": "2021-07-30T14:15:14.840",
  "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-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cross-site scripting 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 inject an arbitrary script by sending a specially crafted request to a specific URL."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de tipo Cross-site scripting en GroupSession (GroupSession Free edition desde versión 2.2.0 hasta versión anterior a 5.1.0, GroupSession byCloud desde versión 3.0.3 hasta versión anterior a 5.1.0, y GroupSession ZION desde versión 3.0.3 hasta versión anterior a 5.1.0) permite a un atacante remoto inyectar un script arbitrario mediante el envío de una petición especialmente diseñada hacia una URL específica"
    }
  ],
  "lastModified": "2026-06-17T03:34:27.173",
  "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"
}