CVE-2026-50159

{
  "id": "CVE-2026-50159",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-06T22:17:17.180",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text can inject arbitrary CSS into the rendered page, potentially altering the appearance or behavior of unrelated page elements. This issue is fixed in versions 10.9.8 and 11.16.1."
    },
    {
      "lang": "es",
      "value": "Mermaid es una herramienta de JavaScript que utiliza texto inspirado en Markdown para crear y modificar diagramas y gráficos. Antes de las versiones 10.9.8 y 11.16.1, Mermaid es vulnerable a la inyección de CSS a través de selectores combinadores de hermanos generados a partir de nombres de clase o ID proporcionados por el diagrama. Un atacante que puede proporcionar texto de diagrama puede inyectar CSS arbitrario en la página renderizada, alterando potencialmente la apariencia o el comportamiento de elementos de página no relacionados. Este problema se ha solucionado en las versiones 10.9.8 y 11.16.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "mermaid-js",
          "product": "mermaid",
          "versions": [
            {
              "version": "< 10.9.8",
              "status": "affected"
            },
            {
              "version": ">= 11.0.0-alpha.1, < 11.16.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/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",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "PASSIVE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "LOW",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-07T17:18:05.573812Z",
          "id": "CVE-2026-50159",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5266ed",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266f4c5e",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mermaid-js/mermaid/pull/8022",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mermaid-js/mermaid/releases/tag/[email protected]",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx",
      "source": "[email protected]"
    }
  ]
}