CVE-2026-39889

HIGH

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

Title source: cna

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.

References (1)

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

Scores

CVSS v3 7.5

EPSS 0.0002

EPSS Percentile 6.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-200

Status published

Products (3)

MervinPraison/PraisonAI < 4.5.115

praison/praisonai < 4.5.114

pypi/praisonai 0 - 4.5.115PyPI

Published Apr 08, 2026

Tracked Since Apr 09, 2026