CVE-2026-43899

{"id": "CVE-2026-43899", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43899", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-12T12:52:25.316290Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.6, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ThinkInAIXYZ", "product": "deepchat", "versions": [{"status": "affected", "version": "< 1.0.4-beta.1"}]}]}], "published": "2026-05-11T23:20:21.410", "references": [{"url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-cp8j-jx7q-7r5f", "source": "security-advisories@github.com"}, {"url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-cp8j-jx7q-7r5f", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-20"}]}], "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 c\u00f3digo abierto que unifica modelos, herramientas y agentes. Antes de la v1.0.4-beta.1, una mitigaci\u00f3n incompleta para CVE-2025-55733 deja a DeepChat vulnerable a una omisi\u00f3n de ejecuci\u00f3n de protocolo arbitrario (RCE). Aunque el parche restringi\u00f3 correctamente API.openExternal() dentro del script preload/index.ts del renderizador, estructuralmente descuid\u00f3 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 intercepci\u00f3n de ventana nativa target=\u2019_blank\u2019 en tabPresenter.ts, que reenv\u00eda la URL maliciosa directamente a shell.openExternal(url) y omite completamente el l\u00edmite de seguridad isValidExternalUrl. Esta vulnerabilidad est\u00e1 corregida en la v1.0.4-beta.1."}], "lastModified": "2026-10-26T18:10:00.173", "sourceIdentifier": "security-advisories@github.com"}