SSRF in Universal-Tool-Calling-Protocol Python-Utcp
CVE-2026-101059
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA… (vendor-advisory)
- www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-bound… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-101059?
- CVE-2026-101059 is a high-severity vulnerability in Universal-Tool-Calling-Protocol Python-Utcp, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.1/10. Published 2026-09-27.
- How severe is CVE-2026-101059?
- High severity. CVSS v3 base score is 7.1 out of 10.