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CVE-2026-59563

HMAC Confirmation Token Unbinding in zscaler-mcp-server

Zscaler zscaler-mcp-server
Open in ThreatlineRecord JSON
CVSS
4.6Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.7.2Fixed versionCVE List
Published28 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 1

  • zscaler-mcp-serveraffected: 0.7.0 before 0.7.2CVE List

References 1