CVE-2026-101059
utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 27, 2026
- Updated
- Sep 28, 2026
- Reserved
- Sep 27, 2026
Description
utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
python-utcpuniversal-tool-calling-protocol |
|
References
- GitHub Security Advisory (GHSA-8cp3-qxj6-px34)vendor-advisory
- VulnCheck Advisory: utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypassthird-party-advisory
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