PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
Priority LOW 39CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00433 37th percentileScored 2026-11-07
Fix Fixed PraisonAI (MervinPraison): 4.5.115praisonai (PyPI): 4.5.115
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MervinPraison | PraisonAI | before 4.5.115 | 4.5.115 | Patch available | CNA |
| — | praisonai (PyPI) | before 4.5.115 | 4.5.115 | Patch available | GHSA-f292-66h9-fpmf |
- PraisonAI VendorMervinPraison Affected before 4.5.115 Fixed in 4.5.115 Patch available CNA
- praisonai (PyPI) Vendor— Affected before 4.5.115 Fixed in 4.5.115 Patch available GHSA-f292-66h9-fpmf
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* | up to 4.5.114 | Vulnerable | MervinPraison |
- cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* Versions up to 4.5.114 Vulnerable ·MervinPraison
Remediation
- Fix · CNA PraisonAI (MervinPraison) Fixed in 4.5.115
- Fix · GHSA-f292-66h9-fpmf praisonai (PyPI) Fixed in 4.5.115 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-39889
- 2026-10-03 Alias added: GHSA-f292-66h9-fpmf
References
More MervinPraison Praisonai vulnerabilities
- TI-2026-30083 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI CVSS 3.1CRITICAL 9.8
- TI-2026-29070 PraisonAI: Critical RCE via `type: job` workflow YAML CVSS 3.1CRITICAL 9.8
- TI-2026-28940 PraisonAI has Server-Side Request Forgery via Unvalidated webhook_url in Jobs API CVSS 3.1CRITICAL 10.0
- TI-2026-28768 PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading CVSS 3.1CRITICAL 9.8
- TI-2026-27159 PraisonAI: OS Command Injection in MCPHandler.parse_mcp_command() CVSS 3.1CRITICAL 9.8
- TI-2026-27158 PraisonAI: Second-Order SQL Injection in `get_all_user_threads` CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-39889 · CVE Program
- CVE-2026-39889 · NVD
- FIRST EPSS
- GHSA-f292-66h9-fpmf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences