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TI-2026-42525 Aliases CVE-2026-59563GHSA-6wjq-5f4c-p8f7

HMAC Confirmation Token Unbinding in zscaler-mcp-server

Priority LOW 20CWE-305Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00131 2nd percentileScored 2026-11-07
Fix Fixed zscaler-mcp-server (Zscaler): 0.7.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Zscalerzscaler-mcp-server0.7.0 to before 0.7.20.7.2Patch availableCNA
  • zscaler-mcp-server VendorZscaler Affected 0.7.0 to before 0.7.2 Fixed in 0.7.2 Patch available CNA

Remediation

  • Fix · CNA zscaler-mcp-server (Zscaler) Fixed in 0.7.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59563
  2. 2026-10-03 Alias added: GHSA-6wjq-5f4c-p8f7

References

Other 1

  • TI-2023-22133 Inappropriate file type control in Zscaler Proxy versions 3.6.1.25 and prior allows local… CVSS 3.1MEDIUM 5.5
  • TI-2026-42530 Remote code execution in Zscaler Client Connector CVSS 3.1CRITICAL 9.1
  • TI-2026-42526 Authentication bypass between ZCC and client connector portal CVSS 3.1CRITICAL 9.1
  • TI-2020-09334 The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer… CVSS 3.1CRITICAL 9.8
  • TI-2024-15528 Local Privilege Escalation via lack of input validation CVSS 3.1CRITICAL 9.8
  • TI-2025-34691 SAML 2.0 Public Key Validation Issue CVSS 3.1CRITICAL 9.6
See all 58 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences