CVE-2026-79786
Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP OAuth Client Registration
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | coroot |
| Product | coroot |
| Published | Aug 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
coroot / coroot
1.20.2 ≤ 1.24.5
References
github.com: https://github.com/coroot/coroot github.com: https://github.com/coroot/coroot/issues/929 github.com: https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.go vulncheck.com: https://www.vulncheck.com/advisories/coroot-1.20.2-through-1.24.5-unvalidated-redirect-uri-in-mcp-oauth-client-registration
Credits
George Chen