CVE-2026-39889 PUBLISHED

PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server

Assigner: GitHub_M
Reserved: 07.04.2026 Published: 08.04.2026 Updated: 08.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	MervinPraison
Product	PraisonAI
Versions	Version < 4.5.115 is affected

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf

Problem Types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE