CVE-2026-43899

{
  "id": "CVE-2026-43899",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-11T23:20:21.410",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "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, An incomplete mitigation for CVE-2025-55733 leaves DeepChat vulnerable to an arbitrary protocol execution bypass (RCE). While the patch correctly restricted api.openExternal() inside the renderer's preload/index.ts script, it structurally neglected to sanitize native Electron pop-up window handlers. An attacker or a compromised AI endpoint returning a Markdown link can trigger a target=\"_blank\" native window interception in tabPresenter.ts, which forwards the malicious URL directly to shell.openExternal(url) and completely bypasses the isValidExternalUrl security boundary. This vulnerability is fixed in v1.0.4-beta.1."
    },
    {
      "lang": "es",
      "value": "DeepChat es una plataforma de agentes de inteligencia artificial de código abierto que unifica modelos, herramientas y agentes. Antes de la v1.0.4-beta.1, una mitigación incompleta para CVE-2025-55733 deja a DeepChat vulnerable a una omisión de ejecución de protocolo arbitrario (RCE). Aunque el parche restringió correctamente API.openExternal() dentro del script preload/index.ts del renderizador, estructuralmente descuidó sanear los manejadores de ventanas emergentes nativas de Electron. Un atacante o un endpoint de IA comprometido que devuelve un enlace Markdown puede activar una intercepción de ventana nativa target=’_blank’ en tabPresenter.ts, que reenvía la URL maliciosa directamente a shell.openExternal(url) y omite completamente el límite de seguridad isValidExternalUrl. Esta vulnerabilidad está corregida en la v1.0.4-beta.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "ThinkInAIXYZ",
          "product": "deepchat",
          "versions": [
            {
              "version": "< 1.0.4-beta.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "baseScore": 9.6,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-12T12:52:25.316290Z",
          "id": "CVE-2026-43899",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-cp8j-jx7q-7r5f",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-cp8j-jx7q-7r5f",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}