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Medium · 4.6 CVE-2026-59563 EUVD-2026-88244GHSA-6wjq-5f4c-p8f7

HMAC Confirmation Token Unbinding in zscaler-mcp-server

Published Sep 28, 2026 · Updated Sep 28, 2026 · Assigned by Zscaler

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.

Affected products

VendorProductAffectedFixed
Zscaler zscaler-mcp-server 0.7.0 – < 0.7.2 0.7.2

References