{"id":"CVE-2026-57496","summary":"NetLicensing MCP Server: REST Path Traversal Bypasses Token Redaction","details":"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.","aliases":["GHSA-hxpf-9xvq-wph8","PYSEC-2026-3489"],"modified":"2026-10-17T02:48:23.530915179Z","published":"2026-10-15T18:40:16.558Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57496.json"},"references":[{"type":"WEB","url":"https://github.com/Labs64/NetLicensing-MCP/releases/tag/0.1.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57496.json"},{"type":"ADVISORY","url":"https://github.com/Labs64/NetLicensing-MCP/security/advisories/GHSA-hxpf-9xvq-wph8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57496"},{"type":"FIX","url":"https://github.com/Labs64/NetLicensing-MCP/commit/b8fd0ea76d533202573eb24add9fb2fbd9331496"},{"type":"FIX","url":"https://github.com/Labs64/NetLicensing-MCP/pull/6"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/labs64/netlicensing-mcp","events":[{"introduced":"0"},{"fixed":"b8fd0ea76d533202573eb24add9fb2fbd9331496"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.1.8"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["0.1.7","0.1.6","0.1.5","0.1.4","0.1.3","0.1.2","0.1.1","0.1.0","0.0.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57496.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"}]}