CVE-2026-79786
Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP OAuth Client Registration
- State
- Published
- Severity
- 7.0 High
- Published
- Aug 25, 2026
- Updated
- Aug 28, 2026
- Reserved
- Aug 25, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.0 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
corootcoroot |
|
References
- https://github.com/coroot/corootproduct
- https://github.com/coroot/coroot/issues/929issue-tracking
- https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.gotechnical-description
- VulnCheck Advisory: Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP OAuth Client Registrationthird-party-advisory
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