CVE-2026-39889CWE-200

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

High · published April 8, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
40.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00480 · 40.5th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-04-08T20:44Z
EPSS history
Timeline
  • 08 APR 20:44Z
    PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
    cvelistv5