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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
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.
Which versions are affected by CVE-2026-57123?
3 open source packages ship an affected version, including praisonaiagents.
| Package | 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.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-57123 being exploited?
There is no known exploitation of CVE-2026-57123 in the wild and no public exploit code.
Sources
Also known as GHSA-x227-pf99-vffg, PYSEC-2026-3536.