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CVE-2026-59563— HMAC Confirmation Token Unbinding in zscaler-mcp-server

Quick assessment

Affected
Zscaler zscaler-mcp-server
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.

Zscaler MCP Server 版本 0.7.0 和 0.7.1 存在以下问题：HMAC 确认令牌未与目标资源标识符绑定，导致 MCP 客户端或代理可以重放针对某一资源生成的令牌，从而影响同一类型的另一资源。该问题已在版本 0.7.2 中修复。

CVSS 4.6 · Medium

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zscaler zscaler-mcp-server 0.7.0< 0.7.2 affected
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I. Basic Information for CVE-2026-59563

Vulnerability Information
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Vulnerability Title
HMAC Confirmation Token Unbinding in zscaler-mcp-server
Source: CVE Program / CVE List V5
Vulnerability Description
Zscaler MCP Server versions 0.7.0 and 0.7.1 has an issue where HMAC confirmation tokens were not bound to the target resource identifier, allowing an MCP client or agent to replay a token generated for one resource to affect another resource of the same type. This issue is fixed in version 0.7.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用基本弱点进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zscaler zscaler-mcp-server 0.7.0 ~ 0.7.2 -

II. Public POCs for CVE-2026-59563

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III. Intelligence Information for CVE-2026-59563

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Patches & Fixes for CVE-2026-59563 (1)

IV. Related Vulnerabilities

Same vendor: Zscaler
Same weakness: CWE-305

V. Comments for CVE-2026-59563

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