CVE-2026-59563: Zscaler Zscaler-Mcp-Server

Medium severity, CVSS 4.6. EPSS: 0.1% chance of exploitation in the next 30 days.

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

• Zscaler Zscaler-Mcp-Server: from 0.7.0, before 0.7.2 (fixed in 0.7.2)

Published 2026-09-28. Last modified 2026-09-28.