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

> CVE-2026-59563: HMAC Confirmation Token Unbinding in zscaler-mcp-server. CVSS 4.6 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-59563
Last updated: 2026-09-28T15:17:17Z

- Published: 2026-09-28 12:54 UTC · Updated: 2026-09-28 15:17 UTC · Assigner: Zscaler
- CVSS: 4.6 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
- EPSS: 0.13%, 3th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-305

## 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 vendors and products

- Zscaler: zscaler-mcp-server

## Tracked companies

- [Zscaler](https://rewindex.com/company/zscaler.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-59563)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-59563)
- [https://github.com/zscaler/zscaler-mcp-server/pull/41](https://github.com/zscaler/zscaler-mcp-server/pull/41)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-59563 · Markdown: https://rewindex.com/cve/CVE-2026-59563.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-59563 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:43.046Z