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CVE-2026-57496

CVE-2026-57496 · NetLicensing MCP Server: REST Path Traversal Bypasses Token Redaction

This page contains facts from public vulnerability sources. Check the original advisory before updating.

NetLicensing MCP Server is a natural-language interface that enables agentic applications to manage the software-licensing lifecycle in Labs64 NetLicensing. Prior to 0.1.8, netlicensing_get_product passes the caller-controlled product_number to src/netlicensing_mcp/tools/products.py, which interpolates it into a REST path consumed by nl_get() in src/netlicensing_mcp/client.py without path-segment validation. A traversal segment can be normalized from the intended product path to the /token endpoint, after which the response is serialized through _wrap_json instead of _wrap_json_token_read, bypassing redact_token_read() protections for APIKEY number and SHOP shopURL fields. An authenticated MCP client with a non-administrative API key can retrieve plaintext token values, and a recovered administrative token can provide broad read, write, and delete access to the NetLicensing account. This issue is fixed in version 0.1.8.

CVSS 9.6 · Critical · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • netlicensing-mcp

    Versions
    • < 0.1.8: Affected

    No fix published

  • netlicensing-mcp PyPI

    Versions
    • 0.0.6
    • 0.1.0
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    Affected ranges
    • ECOSYSTEM: < 0.1.8

    Update to 0.1.8

Original sources

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