CVE-2026-101059CWE-918ssrf

CVE-2026-101059

High · published September 27, 2026

CVSS v3.1
7.1
EPSS
0%
Percentile
7.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00182 · 7.4th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-09-27T22:16Z
References (3)
https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34 · [email protected]https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass · [email protected]https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 29 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 27 SEP 17:02Z
    utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass
    cvelistv5