---
title: "CVE-2026-57123: PraisonAI: MCP SSE transport binds 0.0.0.0 with no authentication and no Origin validation; bundled SecurityConfig is never wired in"
url: https://erroneo.us/security/cve/CVE-2026-57123/
description: "CVE-2026-57123 (praisonaiagents (PyPI)): PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59, ToolsMCPServer.runsse and…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-14
date_modified: 2026-09-14
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-57123"
kev: false
cvss: 9.8
epss: 0.00904
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-57123: PraisonAI: MCP SSE transport binds 0.0.0.0 with no authentication and no Origin validation; bundled SecurityConfig is never wired in

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.9% , percentile 59: FIRST’s model estimates a 0.9% chance of exploitation activity in the next 30 days, higher than 59% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes praisonaiagents (PyPI) < 1.6.59, fixed in 1.6.59 . Check your lockfile, including transitive dependencies.

## What it is

PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59, ToolsMCPServer.runsse and launchtoolsmcpserver bind to 0.0.0.0 and create /sse and /messages/ routes without invoking the available SecurityConfig authentication, origin-validation, or DNS-rebinding controls. Any reachable client can list and invoke registered tools, and a browser can target a local instance through DNS rebinding, with impact determined by the registered file, shell, and code-execution tools. This vulnerability is fixed in praisonaiagents 1.6.59.

## Affected packages

- PyPI `praisonaiagents` < 1.6.59 → fixed: 1.6.59

## Affected products (CVE record)

- MervinPraison praisonaiagents: < 1.6.59

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.90% probability of exploitation activity in the next 30 days; percentile 59.

## Sources

- [GitHub Advisory GHSA-x227-pf99-vffg](https://github.com/advisories/GHSA-x227-pf99-vffg)
- [CVE.org record CVE-2026-57123](https://www.cve.org/CVERecord?id=CVE-2026-57123)
- [NVD entry CVE-2026-57123](https://nvd.nist.gov/vuln/detail/CVE-2026-57123)
- [github.com](https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-x227-pf99-vffg)
- [github.com](https://github.com/MervinPraison/PraisonAI/commit/2adfe7e8323f6deec66925cf15a885b6238895e9)
- [github.com](https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.59)

---
Source page: https://erroneo.us/security/cve/CVE-2026-57123/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt