CVE-2026-79786
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
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, and exchange them for access tokens to hijack MCP sessions.
Risk Assessment
The risk includes session hijacking of MCP users, potentially leading to unauthorized access to data and system functions.
Recommendation
Upgrade Coroot to a version that validates redirect URIs, and implement measures to prevent authorization code interception.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

