CVE-2026-79786

Description

Coroot's unauthenticated MCP OAuth dynamic client registration endpoint accepts any syntactically valid redirect URI without validation, allowing attackers to register clients pointing to attacker-controlled hosts. Attackers can send authorization URLs to signed-in users, capture their authorization codes upon consent approval, and exchange them for access tokens to hijack MCP sessions.

CVSS Vector

References

• https://github.com/coroot/coroot
• https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.go
• https://github.com/coroot/coroot/issues/929
• https://www.vulncheck.com/advisories/coroot-1.20.2-through-1.24.5-unvalidated-redirect-uri-in-mcp-oauth-client-registration