CVE Catalog

CVE-2026-79786

HighCVSS 7.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.22%

12th percentile - higher than 12% 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.

Related vulnerabilities

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