FKIE_CVE-2026-26226

Vulnerability from fkie_nvd - Published: 2026-02-13 17:16 - Updated: 2026-06-17 10:25
Severity
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Summary
beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping, allowing crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin.
References
disclosure@vulncheck.comhttps://github.com/lukilabs/beautiful-mermaid/pull/8
disclosure@vulncheck.comhttps://github.com/lukilabs/beautiful-mermaid/releases/tag/v0.1.3
disclosure@vulncheck.comhttps://neo.projectdiscovery.io/share/cec71dc7-a8eb-417e-b8b4-666644796c1e
disclosure@vulncheck.comhttps://www.vulncheck.com/advisories/beautiful-mermaid-svg-attribute-injection
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageName": "beautiful-mermaid",
          "product": "beautiful-mermaid",
          "repo": "https://github.com/lukilabs/beautiful-mermaid",
          "vendor": "lukilabs",
          "versions": [
            {
              "lessThan": "0.1.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping, allowing crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin."
    },
    {
      "lang": "es",
      "value": "Las versiones de beautiful-mermaid anteriores a la 0.1.3 contienen un problema de inyecci\u00f3n de atributos SVG que puede llevar a cross-site scripting (XSS) al renderizar diagramas de Mermaid controlados por el atacante. Los valores controlados por el usuario de las directivas de estilo y classDef de Mermaid se interpolan en los valores de los atributos SVG sin un escape adecuado, permitiendo que una entrada manipulada escape de un contexto de atributo e inyecte elementos/atributos SVG arbitrarios en la salida renderizada. Cuando el SVG generado se incrusta en una p\u00e1gina web, esto puede resultar en la ejecuci\u00f3n de scripts en el contexto del origen de incrustaci\u00f3n."
    }
  ],
  "id": "CVE-2026-26226",
  "lastModified": "2026-06-17T10:25:58.653",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-26226",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-13T16:57:59.724462Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-13T17:16:14.073",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/lukilabs/beautiful-mermaid/pull/8"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/lukilabs/beautiful-mermaid/releases/tag/v0.1.3"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://neo.projectdiscovery.io/share/cec71dc7-a8eb-417e-b8b4-666644796c1e"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/beautiful-mermaid-svg-attribute-injection"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "disclosure@vulncheck.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

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.