# 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

> Unauthenticated remote attackers can invoke registered tools, potentially executing code or accessing files, due to missing authentication and origin validation in the MCP SSE transport.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-x227-pf99-vffg, PYSEC-2026-3536

## What is CVE-2026-57123?

CVE-2026-57123 is a critical missing authorization vulnerability in MervinPraison praisonaiagents, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.59, ToolsMCPServer.run_sse and launch_tools_mcp_server 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.

Weakness: CWE-350 (Reliance on Reverse DNS Resolution for a Security-Critical Action), CWE-306 (Missing Authentication for Critical Functionality), CWE-1327 (Binding to an Unrestricted IP Address)

## Which versions are affected by CVE-2026-57123?

3 open source packages ship an affected version, including praisonaiagents.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `praisonaiagents` | PyPI | All versions | 1.6.59 |
| `praisonaiagents` | PyPI | All versions | 1.6.59 |
| `praisonaiagents` | PyPI | All versions | 1.6.59 |

## How do I fix CVE-2026-57123?

Upgrade praisonaiagents to 1.6.59 or later.

## Is CVE-2026-57123 being exploited?

There is no known exploitation of CVE-2026-57123 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57123 and fix it if it is affected.

What it is: CVE-2026-57123 is a critical missing authorization vulnerability in MervinPraison praisonaiagents, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-57123 in the wild and no public exploit code.

Affected packages and fixed versions:
- praisonaiagents (PyPI): affected all versions; fixed in 1.6.59
- praisonaiagents (PyPI): affected all versions; fixed in 1.6.59
- praisonaiagents (PyPI): affected all versions; fixed in 1.6.59

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-57123/ (Markdown: https://insights.sbomify.com/CVE-2026-57123/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57123
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57123
- OSV: https://osv.dev/vulnerability/CVE-2026-57123

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57123/
Summaries are generated and may contain mistakes; the official description above is the record.