CVE-2026-39889— PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
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I. Basic Information for CVE-2026-39889
Vulnerability Information
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Vulnerability Title
PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
Source: NVD (National Vulnerability Database)
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to 4.5.115, the A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. The create_a2u_routes() function registers the following endpoints with NO authentication checks: /a2u/info, /a2u/subscribe, /a2u/events/{stream_name}, /a2u/events/sub/{id}, and /a2u/health. This vulnerability is fixed in 4.5.115.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
PraisonAI 信息泄露漏洞
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 4.5.115之前版本存在信息泄露漏洞，该漏洞源于事件流服务器缺少身份验证，可能导致信息泄露。
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)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MervinPraison | PraisonAI | < 4.5.115 | - |
II. Public POCs for CVE-2026-39889
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|---|
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Same Patch Batch · MervinPraison · 2026-04-08 · 4 CVEs total
| CVE-2026-39888 | 10.0 CRITICAL | PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subp |
| CVE-2026-39890 | 9.8 CRITICAL | PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition L |
| CVE-2026-39891 | 8.8 HIGH | PraisonAI has a Template Injection in Agent Tool Definitions |
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V. Comments for CVE-2026-39889
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