PatchSiren cyber security CVE debrief
CVE-2026-61427 MervinPraison CVE debrief
CVE-2026-61427 is a vulnerability in PraisonAI before version 4.6.78. The MCP HTTP-stream transport is exposed 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. An unauthenticated client can initialize a session, enumerate available tools, and invoke tools without an API key. 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 binding to a network-accessible address.
- Vendor
- MervinPraison
- Product
- PraisonAI
- CVSS
- MEDIUM 6.9
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-15
- Original CVE updated
- 2026-07-16
- Advisory published
- 2026-07-15
- Advisory updated
- 2026-07-16
Who should care
Operators and users of PraisonAI before version 4.6.78 should be aware of this vulnerability and take steps to mitigate it. This includes configuring an API key and ensuring the server is not bound to a network-accessible address.
Technical summary
The PraisonAI MCP HTTP-stream transport is exposed without authentication by default. The CLI --api-key option defaults to None, allowing an unauthenticated client to initialize a session, enumerate available tools (tools/list), and invoke tools (tools/call). The dispatcher forwards tool-call arguments to handlers without validating them against the advertised inputSchema. Remote exploitation requires the operator to bind to a network-accessible address.
Defensive priority
Medium
Recommended defensive actions
- Configure an API key for PraisonAI
- Bind the server to a non-network-accessible address
- Validate tool-call arguments against the advertised inputSchema
- Monitor for unauthorized access attempts
- Perform regular security audits
- Implement additional logging and monitoring
- Review and update incident response plans
Evidence notes
The CVE record was published on 2026-07-15T12:18:18.260Z and has been modified since then. The NVD entry is currently Deferred. Limited information is available about the vulnerability, and further investigation is needed to fully understand the impact.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-15T12:18:18.260Z and has been modified since then. The NVD entry is currently Deferred.