PYSEC-2026-3490 NetLicensing-MCP: Unauthenticated Use of Server-Side NetLicensing API Key in HTTP Mode

Unauthenticated Use of Server-Side NetLicensing API Key in HTTP Mode Summary When netlicensing-mcp is run in HTTP transport mode, the ApiKeyMiddleware fails to enforce authentication: requests that carry no client API key are unconditionally forwarded to the next handler server.py:1427. The...

CVE-2026-57496

creationtimestamp| type| source ---|---|--- 2026-07-21 14:35:14+00:00| published-proof-of-concept| https://github.com/Labs64/NetLicensing-MCP/security/advisories/GHSA-hxpf-9xvq-wph8 2026-07-23 17:06:05+00:00| seen| https://bsky.app/profile/stackflag.bsky.social/post/3mrdd4qyqvr2a...

Authentication Bypass

netlicensing-mcp is vulnerable to Authentication Bypass. The vulnerability is due to the API key middleware failing to enforce authentication and falling back to the server operator's API key, which allows an unauthenticated attacker to invoke privileged MCP operations under the operator's identi...