Is CVE-2026-59563 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-59563?

CVE-2026-59563 has a CVSS v3 severity of MEDIUM (4.6).

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CVE-2026-59563

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.