CVE-2026-59563
HMAC Confirmation Token Unbinding in zscaler-mcp-server
CVSS Score
4.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-305 |
| Vendor | zscaler |
| Product | zscaler-mcp-server |
| Published | Sep 28, 2026 |
| Last Updated | Sep 28, 2026 |
Stay Ahead of the Next One
Get instant alerts for zscaler zscaler-mcp-server
Be the first to know when new medium vulnerabilities affecting zscaler zscaler-mcp-server are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
Zscaler / zscaler-mcp-server
0.7.0 < 0.7.2
References
Credits
Sebastián Alba Vives