# CVE-2026-57123: PraisonAI Tools MCP Server authentication bypass

Source: https://junglewise.ai/threats/cve-2026-57123-praisonai-tools-mcp-server-authentication-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-57123 · Severity: critical · CVSS 9.8 · Published 2026-09-14

PraisonAI is a multi-agent framework that orchestrates autonomous AI teams to accomplish complex tasks. The ToolsMCPServer component fails to enforce authentication controls on its API endpoints, allowing any network-reachable client to discover and execute registered tools (including file operations, shell commands, and code execution) without authorization. A malicious user or malware can exploit this to gain complete system access and control.

Technologies: [praisonaiagents (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonaiagents). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-57123 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57123 being exploited in the wild.

**How severe is CVE-2026-57123?** Critical severity, with a CVSS score of 9.8, published 14 September 2026.

**Which products and versions are affected?** praisonaiagents (PyPI) ECOSYSTEM:introduced=0,fixed=1.6.59.

**Is there a fix for CVE-2026-57123?** Yes. praisonaiagents (PyPI): upgrade to 1.6.59 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57123 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-57123?** Check whether you run praisonaiagents (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- praisonaiagents (PyPI): upgrade to 1.6.59 or later

  ```sh
  pip install "praisonaiagents>=1.6.59"
  ```


## Technical details

The vulnerability is an authentication bypass in PraisonAI's ToolsMCPServer, specifically in the run_sse() and launch_tools_mcp_server() functions, which bind to 0.0.0.0 and expose /sse and /messages/ endpoints without enforcing available SecurityConfig authentication, origin-validation, or DNS-rebinding protections. Any client with network access can invoke the endpoints to list and trigger registered tools. The scope of damage is determined by which tools are registered—this can include arbitrary file read/write, shell command execution, and code evaluation. DNS rebinding attacks from a browser can bypass localhost isolation. The vulnerability was patched in praisonaiagents version 1.6.59 and later.

## Affected products

- PraisonAI praisonaiagents before 1.6.59

## Identifiers

- CVE-2026-57123
- GHSA-x227-pf99-vffg
- PYSEC-2026-3536

## Timeline

- 2026-09-14: disclosed
- 2026-06-13: patched: Fix committed; version 1.6.59 released

## References

- [https://github.com/MervinPraison/PraisonAI/commit/2adfe7e8323f6deec66925cf15a885b6238895e9](https://github.com/MervinPraison/PraisonAI/commit/2adfe7e8323f6deec66925cf15a885b6238895e9)
- [https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.59](https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.59)

## Related threats

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- [PraisonAI missing access control in API endpoints](https://junglewise.ai/threats/cve-2026-57118-praisonai-agentteam-launch-exposes-unauthenticated-remote-agent)
- [PraisonAI legacy SSE endpoint CORS and authentication bypass](https://junglewise.ai/threats/cve-2026-57112-praisonai-legacy-sse-endpoint-cors-and-authentication-bypass)
- [PraisonAI IMAP injection in email tools](https://junglewise.ai/threats/cve-2026-57130-praisonai-imap-injection-in-email-tools)
- [PraisonAI path traversal in file mention parsing](https://junglewise.ai/threats/cve-2026-57129-praisonai-path-traversal-in-file-mention-parsing)