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High · 7.5 CVE-2026-39889 EUVD-2026-20636GHSA-f292-66h9-fpmfPYSEC-2026-2911

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

Published Apr 8, 2026 · Updated Apr 10, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
MervinPraison PraisonAI < 4.5.115 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI praisonai < 4.5.115 4.5.115 GHSA-f292-66h9-fpmf

References