CVE-2026-101059

HIGH 7.1

utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	universal-tool-calling-protocol
Product	python-utcp
Published	Sep 27, 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

universal-tool-calling-protocol / python-utcp

0 < 1.1.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34 vulncheck.com: https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass

Credits

🔍 EQSTLab 232-323