Is this vulnerability remotely exploitable?

It can be, depending on how PraisonAI is deployed. If the A2U service is reachable over the Internet or from untrusted networks, remote attackers could directly access the exposed endpoints without authentication.

What level of access does an attacker need to exploit this issue?

An attacker only needs network-level connectivity to the A2U endpoints. No valid user account, session, or token is required because the routes do not enforce authentication checks.

What is the safest general fix pattern for this vulnerability?

The safest pattern is to enforce strict authentication and authorization on all A2U routes, ensuring only intended, authenticated clients can subscribe to or query agent activity. Pair this with a default-deny approach for new endpoints and limit what data is exposed.

Severity:

HIGH RISK

(7.5)

Unauthenticated Information Exposure (CWE-200) in PraisonAI A2U Event Stream Server

CVE-2026-39889

Published:

Apr 8, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Information Exposure / Broken Access Control

CWE:

CWE-200

Impact:

Exposure of sensitive agent activity and interaction data

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Information Exposure / Broken Access Control

CWE:

CWE-200

Impact:

Exposure of sensitive agent activity and interaction data

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Unauthenticated Information Exposure (CWE-200) in PraisonAI A2U Event Stream Server

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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