CVE-2026-61427

Description

PraisonAI before 4.6.78 exposes the MCP HTTP-stream transport without authentication by default: the CLI --api-key option defaults to None, and the server only enforces Authorization/Bearer checks when an API key is configured. When an operator runs 'praisonai mcp serve --transport http-stream' without an API key, an unauthenticated client (no Authorization header, and no Origin header, which is also permitted) can initialize a session, enumerate the available tools (tools/list), and invoke tools (tools/call). Additionally, the dispatcher forwards tool-call arguments to handlers without validating them against the advertised inputSchema. The server binds to 127.0.0.1 by default, so remote exploitation requires the operator to bind to a network-accessible address (e.g., --host 0.0.0.0).

Severity (CVSS)

Weaknesses

• CWE-20 — Improper Input Validation

Affected products

References

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-hc5v-gxvj-58wh (vendor-advisory)
• https://www.vulncheck.com/advisories/praisonai-before-authentication-bypass-via-http-stream (third-party-advisory)