CVE-2026-39889

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

At a glance

Severity: HIGH 7.5
EPSS: EPSS 0.42 % · percentile 36 (2026-10-27)
State: PUBLISHED
Published: 2026-04-08
Updated: 2026-04-10
Assigner: GitHub_M
NVD status: Analyzed

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	GitHub_M
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

CWE-200

Advisories

GHSA-f292-66h9-fpmf — PraisonAI Has Unauthenticated SSE Event Stream that Exposes All Agent Activity in A2U Server
PYSEC-2026-2911 — PraisonAI Has Unauthenticated SSE Event Stream that Exposes All Agent Activity in A2U Server

European references

ENISA EUVD · EUVD-2026-20636
GCVE · GCVE-0-2026-39889

Affected configurations (NVD CPE)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* ≤ 4.5.114

Affected products

Product	Versions
MervinPraison · PraisonAI	affected < 4.5.115

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD