CVE-2026-40289— PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions
Quick assessment
Affected
MervinPraison PraisonAI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40289
Vulnerability Information
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Vulnerability Title
PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
PraisonAI 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MervinPraison | PraisonAI | < 4.5.139 | - |
|
| MervinPraison | praisonaiagents | < 1.5.140 | - |
|
II. Public POCs for CVE-2026-40289
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-40289 (1)
Same Patch Batch · MervinPraison · 2026-04-14 · 5 CVEs total
| CVE-2026-40288 | 9.8 CRITICAL | PraisonAI: Critical RCE via `type: job` workflow YAML |
| CVE-2026-40313 | 9.1 CRITICAL | PraisonAI: ArtiPACKED Vulnerability via GitHub Actions Credential Persistence |
| CVE-2026-40287 | 8.4 HIGH | PraisonAI has RCE via Automatic tools.py Import |
| CVE-2026-40315 | PraisonAI: SQLiteConversationStore didn't validate table_prefix when constructing SQL quer |
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