CVE-2026-59563

HMAC Confirmation Token Unbinding in zscaler-mcp-server

Published Sep 28, 2026 CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Zscaler
Zscaler zscaler-mcp-server
Vendors & Products Zscaler
Zscaler zscaler-mcp-server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title HMAC Confirmation Token Unbinding in zscaler-mcp-server
Weaknesses CWE-305
References
Metrics cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zscaler
Published
Updated
Sep 28, 2026, 1:31 PM
Reserved
Jul 6, 2026, 6:18 AM
Status
Awaiting Analysis
Published
Sep 28, 2026, 1:17 PM
Modified
Sep 28, 2026, 3:17 PM