Medium 4.6Published Sep 28, 2026

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

Updated under an hour ago (2026-10-19 06:20 UTC)

Does this affect you?

It affects zscaler-mcp-server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for zscaler-mcp-server

Exploited in the last 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.

CVSS: 4.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Weakness (CWE): CWE-305
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Zscaler
NVD analysis: Awaiting Analysis
Record last updated: Sep 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Zscaler zscaler-mcp-server zscaler:mcp_server (from the name)	from 0.7.0 before 0.7.2	CNA record

References

https://github.com/zscaler/zscaler-mcp-server/pull/41

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.