FKIE_CVE-2021-24782

Vulnerability from fkie_nvd - Published: 2021-12-13 11:15 - Updated: 2026-06-17 03:40
Severity
4.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Summary
The Flex Local Fonts WordPress plugin through 1.0.0 does not escape the Class Name field when adding a font, which could allow hight privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
References
contact@wpscan.comhttps://wpscan.com/vulnerability/5cd846df-1d8b-488d-a691-b76850e8687aExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://wpscan.com/vulnerability/5cd846df-1d8b-488d-a691-b76850e8687aExploit, Third Party Advisory
Impacted products
Vendor Product Version
flex_local_fonts_project flex_local_fonts *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Flex Local Fonts",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThanOrEqual": "1.0.0",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "contact@wpscan.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:flex_local_fonts_project:flex_local_fonts:*:*:*:*:*:wordpress:*:*",
              "matchCriteriaId": "1F8E3A26-7E86-40AE-BFCB-E484045EE6AE",
              "versionEndIncluding": "1.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Flex Local Fonts WordPress plugin through 1.0.0 does not escape the Class Name field when adding a font, which could allow hight privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed."
    },
    {
      "lang": "es",
      "value": "El plugin Flex Local Fonts de WordPress versiones hasta 1.0.0 no escapa del campo Class Name al a\u00f1adir una fuente, lo que podr\u00eda permitir a usuarios muy privilegiados llevar a cabo ataques de tipo Cross-Site Scripting incluso cuando la capacidad unfiltered_html est\u00e1 deshabilitada"
    }
  ],
  "id": "CVE-2021-24782",
  "lastModified": "2026-06-17T03:40:53.867",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "NONE",
          "baseScore": 3.5,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 6.8,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "HIGH",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.7,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-12-13T11:15:08.493",
  "references": [
    {
      "source": "contact@wpscan.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://wpscan.com/vulnerability/5cd846df-1d8b-488d-a691-b76850e8687a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://wpscan.com/vulnerability/5cd846df-1d8b-488d-a691-b76850e8687a"
    }
  ],
  "sourceIdentifier": "contact@wpscan.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "contact@wpscan.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.