---
title: "CVE-2026-101059: utcp-http - Open Redirect"
description: "utcp-http < 1.1.4 contains an open redirect caused by failure to validate the OAuth2 tokenUrl field in remote OpenAPI specifications, letting attackers redirect credential submission to arbitrary endpoints, exploit requires victim to register attacker-controlled OpenAPI spec and invoke OAuth2-protected tool."
url: https://panop.io/threat-heartbeat/CVE-2026-101059/
---

# CVE-2026-101059 utcp-http - Open Redirect

utcp-http < 1.1.4 contains an open redirect caused by failure to validate the OAuth2 tokenUrl field in remote OpenAPI specifications, letting attackers redirect credential submission to arbitrary endpoints, exploit requires victim to register attacker-controlled OpenAPI spec and invoke OAuth2-protected tool.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101059)

## Details

Type

Open Redirect

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Published

27 September 2026

Updated

15 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to version 1.1.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-101059](https://nvd.nist.gov/vuln/detail/CVE-2026-101059)
- [https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34](https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34)
- [https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass](https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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