CVE-2026-55529
PraisonAI: Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server
MEDIUM 6.9EPSS 0.2%
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
- MervinPraison · PraisonAI
- CVSS v3.1 GITHUB
- 6.9 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N - EPSS
- 0.18% chance of exploitation in the next 30 days, 7th percentile
- Published
- 2026-08-25
- Updated
- 2026-08-27