CVE-2026-54446 NetLicensing MCP Server: Unauthenticated Use of Server-Side NetLicensing API Key in HTTP Mode
Unauthenticated attackers can access the operator's NetLicensing API key to manage licensing objects when HTTP mode is used with a server-side key.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54446?
CVE-2026-54446 is a high-severity missing authorization vulnerability in Labs64 NetLicensing-MCP, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NetLicensing MCP Server is a natural-language interface that enables agentic applications to manage the software-licensing lifecycle in Labs64 NetLicensing. Prior to 0.1.6, network-reachable HTTP transport requests to /mcp that omit x-netlicensing-api-key, Authorization: Bearer, and the apikey query parameter pass through ApiKeyMiddleware in src/netlicensing_mcp/server.py without authentication. The downstream api_key_ctx in src/netlicensing_mcp/client.py then falls back to the operator's NETLICENSING_API_KEY and authenticates upstream NetLicensing REST API calls under the operator account. An unauthenticated attacker can invoke MCP tools to enumerate products, licenses, licensees, and transactions, create or modify licensing objects, perform validations, and execute destructive delete operations. The issue affects HTTP deployments configured with a server-side key and does not require user interaction. This issue is fixed in version 0.1.6.
Weakness: CWE-306
Which versions are affected by CVE-2026-54446?
3 open source packages ship an affected version, including netlicensing-mcp.
| Package | Affected | Fixed in |
|---|---|---|
netlicensing-mcp PyPI | All versions | 0.1.6 |
netlicensing-mcp PyPI | All versions | 0.1.6 |
netlicensing-mcp PyPI | All versions | 0.1.6 |
How do I fix CVE-2026-54446?
Upgrade netlicensing-mcp to 0.1.6 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-54446 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54446 exists.
Sources
Also known as GHSA-x9vc-9ffq-p3gj, PYSEC-2026-3490.