CVE-2026-40151

MEDIUM NUCLEI

PraisonAI Affected by Unauthenticated Information Disclosure of Agent Instructions via /api/agents in AgentOS

Title source: cna
STIX 2.1

Exploitation Summary

CVE-2026-40151 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

Description

PraisonAI is a multi-agent teams system. Prior to 4.5.128, the AgentOS deployment platform exposes a GET /api/agents endpoint that returns agent names, roles, and the first 100 characters of agent system instructions to any unauthenticated caller. The AgentOS FastAPI application has no authentication middleware, no API key validation, and defaults to CORS allow_origins=["*"] with host="0.0.0.0", making every deployment network-accessible and queryable from any origin by default. This vulnerability is fixed in 4.5.128.

Nuclei Templates (1)

PraisonAI AgentOS - Information Disclosure
MEDIUMVERIFIEDby aryu-ru
Shodan: http.html:"PraisonAI App"
FOFA: body="PraisonAI App"

References (1)

Core 1
Core References

Scores

CVSS v3 5.3
EPSS 0.0086
EPSS Percentile 75.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
MervinPraison/PraisonAI < 4.5.128
praison/praisonai < 4.5.128
pypi/PraisonAI 0 - 4.5.128PyPI
Published Apr 09, 2026
Tracked Since Apr 10, 2026