{"id":"CVE-2026-61740","summary":"LightRAG: Authentication bypass: hardcoded DEFAULT_TOKEN_SECRET and public /auth-status defeat LIGHTRAG_API_KEY protection","details":"LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.4, when LightRAG is deployed with LIGHTRAG_API_KEY set but AUTH_ACCOUNTS unset, X-API-Key protection can be bypassed because lightrag/api/auth.py falls back to a hardcoded DEFAULT_TOKEN_SECRET, /auth-status and /login can mint guest JWTs, and combined_dependency in lightrag/api/utils_api.py accepts a valid guest token before checking the API key. A remote unauthenticated attacker can call endpoints guarded by combined_auth, including document read, upload, deletion, graph mutation, and query endpoints. This vulnerability is fixed in 1.5.4.","aliases":["GHSA-f4vv-55c2-5789"],"modified":"2026-07-17T03:48:23.615930058Z","published":"2026-07-15T14:14:41.064Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-287","CWE-798"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61740.json"},"references":[{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/releases/tag/v1.5.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61740.json"},{"type":"ADVISORY","url":"https://github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61740"},{"type":"FIX","url":"https://github.com/HKUDS/LightRAG/commit/f7819aa3a49a9d8d92eed8251d82d6ebcafa8cba"},{"type":"FIX","url":"https://github.com/HKUDS/LightRAG/pull/3319"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hkuds/lightrag","events":[{"introduced":"0"},{"fixed":"f7819aa3a49a9d8d92eed8251d82d6ebcafa8cba"},{"fixed":"9a45b64c2ee25b1d806e90db926a8af37480bb16"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"1.5.4"}]}}],"versions":["temp","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.5.0rc3","v1.5.0rc2","v1.4.9.1","v1.4.16","v1.4.15","v1.4.14","v1.4.13","v1.4.13rc1","v1.4.12","v1.4.12rc1","v1.4.11","v1.4.11rc1","v1.4.11rc2","v1.4.10","v1.4.9.11","v1.4.9.10","v1.4.9.9","v1.4.9.8","v1.4.9.7","v1.4.9.6","v1.4.9.5","v1.4.9.4","v1.4.9.4rc1","v1.4.9.3","v1.4.9.2","v1.4.9","v1.4.9rc4","v1.4.9rc3","v1.4.9rc2","v1.4.9rc1","v1.4.8.2","v1.4.8.1","v1.4.8","v1.4.8rc9","v1.4.8rc8","v1.4.8rc5","v1.4.8rc4","v1.4.8rc3","v1.4.8rc1","v1.4.7","v1.4.7rc2","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.10","v1.3.9","v1.3.8","v1.3.7","v1.3.6","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.3","v1.2.2","v1.2.1","v1.1.12","v1.1.11","v1.1.10","v1.1.9","v1.1.8","v1.1.7","v1.1.6","v1.1.5","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61740.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"}]}