FKIE_CVE-2026-43900

Vulnerability from fkie_nvd - Published: 2026-05-11 23:20 - Updated: 2026-10-26 18:10
Severity
9.3 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Summary
DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer and the frontend browser rendering engine. The SVGSanitizer (src/main/lib/svgSanitizer.ts) restricts script execution by scrubbing javascript: protocols using plain-text regular expressions. However, it fails to account for HTML entity decoding prior to Vue's v-html DOM insertion inside the SvgArtifact.vue component. By feeding an SVG artifact with obfuscated entities (e.g., javascript:alert(1)), an attacker can completely bypass the sanitizer, culminating in arbitrary JavaScript execution when a victim interacts with the rendered SVG Element. This vulnerability is fixed in v1.0.4-beta.1.
References
security-advisories@github.comhttps://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-7r59-67v3-3mgp
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-7r59-67v3-3mgp
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "deepchat",
          "vendor": "ThinkInAIXYZ",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.4-beta.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer and the frontend browser rendering engine. The SVGSanitizer (src/main/lib/svgSanitizer.ts) restricts script execution by scrubbing javascript: protocols using plain-text regular expressions. However, it fails to account for HTML entity decoding prior to Vue\u0027s v-html DOM insertion inside the SvgArtifact.vue component. By feeding an SVG artifact with obfuscated entities (e.g., j\u0026#x61;vascript:alert(1)), an attacker can completely bypass the sanitizer, culminating in arbitrary JavaScript execution when a victim interacts with the rendered SVG Element. This vulnerability is fixed in v1.0.4-beta.1."
    },
    {
      "lang": "es",
      "value": "DeepChat es una plataforma de agente de inteligencia artificial de c\u00f3digo abierto que unifica modelos, herramientas y agentes. Antes de la v1.0.4-beta.1, existe una vulnerabilidad de cross-site scripting (XSS) debido a una discrepancia entre la capa de validaci\u00f3n del backend y el motor de renderizado del navegador del frontend. El SVGSanitizer (src/main/lib/svgSanitizer.ts) restringe la ejecuci\u00f3n de scripts eliminando los protocolos javascript_disabled: usando expresiones regulares de texto plano. Sin embargo, no tiene en cuenta la decodificaci\u00f3n de entidades HTML antes de la inserci\u00f3n en el DOM de v-html de Vue dentro del componente SvgArtifact.vue. Al alimentar un artefacto SVG con entidades ofuscadas (p. ej., j\u0026#x61;vascript:alert(1)), un atacante puede eludir completamente el saneador, culminando en la ejecuci\u00f3n arbitraria de JavaScript cuando una v\u00edctima interact\u00faa con el elemento SVG renderizado. Esta vulnerabilidad est\u00e1 corregida en la v1.0.4-beta.1."
    }
  ],
  "id": "CVE-2026-43900",
  "lastModified": "2026-10-26T18:10:00.173",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.8,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-43900",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-12T13:18:13.480684Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-11T23:20:21.557",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-7r59-67v3-3mgp"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-7r59-67v3-3mgp"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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