CVE-2026-40289— PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions

PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions

PraisonAI is a multi-agent teams system. In versions below 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents, the browser bridge (praisonai browser start) is vulnerable to unauthenticated remote session hijacking due to missing authentication and a bypassable origin check on its /ws WebSocket endpoint. The server binds to 0.0.0.0 by default and only validates the Origin header when one is present, meaning any non-browser client that omits the header is accepted without restriction. An unauthenticated network attacker can connect, send a start_session message, and the server will route it to the first idle browser-extension WebSocket (effectively hijacking that session) and then broadcast all resulting automation actions and outputs back to the attacker. This enables unauthorized remote control of connected browser automation sessions, leakage of sensitive page context and automation results, and misuse of model-backed browser actions in any environment where the bridge is network-reachable. This issue has been fixed in versions 4.5.139 of PraisonAI and 1.5.140 of praisonaiagents.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

关键功能的认证机制缺失

PraisonAI 访问控制错误漏洞

PraisonAI是Mervin Praison个人开发者的一个低代码多智能体协作框架。 PraisonAI 4.5.139之前版本和praisonaiagents 1.5.140之前版本存在访问控制错误漏洞，该漏洞源于浏览器桥缺少身份验证且存在可绕过的来源检查，可能导致未经验证的远程会话劫持。

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