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CVE-2026-101059— utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass

Quick assessment

Affected
universal-tool-calling-protocol python-utcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 utcp-http 1.1.4 版本之前，该库未对来自远程 OpenAPI 规范的 OAuth2 tokenUrl 字段进行验证，这会导致攻击者将凭据提交重定向到任意端点。当受害者注册一个由攻击者控制的 OpenAPI 规范并调用一个生成的 OAuth2 保护工具时，该库会将受害者的 client_id 和 client_secret 以 POST 方式发送到攻击者指定的 token 端点，而不对 URL 进行任何验证。

CVSS 7.1 · High
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I. Basic Information for CVE-2026-101059

Vulnerability Information
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Vulnerability Title
utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
universal-tool-calling-protocol python-utcp 0 ~ 1.1.4 -

II. Public POCs for CVE-2026-101059

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III. Intelligence Information for CVE-2026-101059

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Vendor Advisories for CVE-2026-101059 (1)

Other References for CVE-2026-101059 (1)

Same Patch Batch · universal-tool-calling-protocol · 2026-09-27 · 5 CVEs total

CVE-2026-101060 8.2 HIGH python-utcp before 1.1.4 SSRF via unvalidated HTTP redirects
CVE-2026-101058 6.9 MEDIUM python-utcp before 1.1.12 SSRF via Remote HTTP Manual
CVE-2026-101061 4.7 MEDIUM utcp-gql and utcp-websocket before 1.1.1 SSRF via URL validation bypass
CVE-2026-101057 3.1 LOW utcp-mcp before 1.1.3 SSRF via unvalidated MCP server URL

IV. Related Vulnerabilities

Same product: python-utcp
Same vendor: universal-tool-calling-protocol
Same weakness: CWE-918

V. Comments for CVE-2026-101059

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