CVE-2026-55529

Summary

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58.

Affected Software

Weaknesses

• CWE-306: CWE-306: Missing Authentication for Critical Function
• CWE-346: CWE-346: Origin Validation Error

References

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3
• https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1
• https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58

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