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CVE-2021-26032

Status: ModifiedMedium (6.1)—

An issue was discovered in Joomla! 3.0.0 through 3.9.26. HTML was missing in the executable block list of MediaHelper::canUpload, leading to XSS attack vectors.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Joomla — Joomla!

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-26032",
  "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": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@joomla.org",
      "affectedData": [
        {
          "vendor": "Joomla! Project",
          "product": "Joomla! CMS",
          "versions": [
            {
              "status": "affected",
              "version": "3.0.0-3.9.26"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-26T11:15:08.673",
  "references": [
    {
      "url": "https://developer.joomla.org/security-centre/852-20210501-core-adding-html-to-the-executable-block-list-of-mediahelper-canupload.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@joomla.org"
    },
    {
      "url": "https://developer.joomla.org/security-centre/852-20210501-core-adding-html-to-the-executable-block-list-of-mediahelper-canupload.html",
      "tags": [
        "Vendor 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": "An issue was discovered in Joomla! 3.0.0 through 3.9.26. HTML was missing in the executable block list of MediaHelper::canUpload, leading to XSS attack vectors."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Joomla! versiones 3.0.0 hasta 3.9.26. Falta HTML en la lista de bloqueo ejecutable de la función MediaHelper::canUpload, conllevando a vectores de ataque de tipo XSS"
    }
  ],
  "lastModified": "2026-06-17T03:42:46.247",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "61420841-4E11-4B1B-94A7-EFA3389B56CD",
              "versionEndIncluding": "3.9.26",
              "versionStartIncluding": "3.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@joomla.org"
}