FKIE_CVE-2026-22218

Vulnerability from fkie_nvd - Published: 2026-01-20 00:15 - Updated: 2026-02-02 20:56
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/<chainlitKey>, allowing disclosure of any file readable by the Chainlit service.
References
disclosure@vulncheck.comhttps://github.com/Chainlit/chainlit/releases/tag/2.9.4Product, Release Notes
disclosure@vulncheck.comhttps://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-elementThird Party Advisory
disclosure@vulncheck.comhttps://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeoverExploit, Mitigation, Third Party Advisory
Impacted products
Vendor Product Version
chainlit chainlit *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:chainlit:chainlit:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "829EC540-D789-4A01-A062-B4EA52818A54",
              "versionEndExcluding": "2.9.4",
              "vulnerable": true
            }
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          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker\u2019s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/\u003cchainlitKey\u003e, allowing disclosure of any file readable by the Chainlit service."
    },
    {
      "lang": "es",
      "value": "Las versiones de Chainlit anteriores a la 2.9.4 contienen una vulnerabilidad de lectura arbitraria de archivos en el flujo de actualizaci\u00f3n de /project/element. Un cliente autenticado puede enviar un Element personalizado con un valor de ruta controlado por el usuario, haciendo que el servidor copie el archivo referenciado en la sesi\u00f3n del atacante. El identificador de elemento resultante (chainlitKey) puede usarse entonces para recuperar el contenido del archivo a trav\u00e9s de /project/file/, permitiendo la divulgaci\u00f3n de cualquier archivo legible por el servicio Chainlit."
    }
  ],
  "id": "CVE-2026-22218",
  "lastModified": "2026-02-02T20:56:44.393",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "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": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-20T00:15:48.910",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/Chainlit/chainlit/releases/tag/2.9.4"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
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      ],
      "url": "https://www.vulncheck.com/advisories/chainlit-arbitrary-file-read-via-project-element"
    },
    {
      "source": "disclosure@vulncheck.com",
      "tags": [
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      "url": "https://www.zafran.io/resources/chainleak-critical-ai-framework-vulnerabilities-expose-data-enable-cloud-takeover"
    }
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  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
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      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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