{"id":"PYSEC-2026-2593","summary":"LightRAG: Hardcoded JWT Signing Secret Allows Authentication Bypass","details":"Subject: Security Vulnerability Report Hardcoded JWT Secret (CVE-2026-30762)\n\nHi HKUDS team,\n\nI'm writing to report a security vulnerability I discovered in LightRAG v1.4.10. This has been assigned CVE-2026-30762 by MITRE.\n\nVulnerability: Hardcoded JWT signing secret\nType: Improper Authentication (CWE-287)\nSeverity: High\nAttack Vector: Remote / Unauthenticated\n\nSummary:\nThe file lightrag/api/config.py (line 397) uses a default JWT secret \"lightrag-jwt-default-secret\" when the TOKEN_SECRET environment variable is not set. The AuthHandler in lightrag/api/auth.py (lines 24-25) uses this secret to sign and verify tokens. An unauthenticated attacker can forge valid JWT tokens using the publicly known default secret and gain access to any protected endpoint.\n\nReproduction:\n1. Install LightRAG v1.4.10 with AUTH_ACCOUNTS configured but no TOKEN_SECRET set\n2. Use PyJWT to sign a token: jwt.encode({\"sub\": \"admin\", \"role\": \"user\"}, \"lightrag-jwt-default-secret\", algorithm=\"HS256\")\n3. Send a request to any protected endpoint with the header: Authorization: Bearer \u003cforged_token\u003e\n4. Access is granted without valid credentials\n\nSuggested Fix:\nRequire TOKEN_SECRET to be explicitly set when AUTH_ACCOUNTS is configured. Refuse to start the API server if authentication is enabled but no custom secret is provided.\n\nI'm following a 90-day responsible disclosure timeline from today's date. Please let me know if you have any questions or need additional information.\n\nBest regards,\nVenkata Avinash Taduturi","aliases":["CVE-2026-30762","GHSA-mcww-4hxq-hfr3"],"modified":"2026-07-13T16:32:03.254234773Z","published":"2026-07-13T14:36:47.915970Z","references":[{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/security/advisories/GHSA-mcww-4hxq-hfr3"},{"type":"PACKAGE","url":"https://github.com/HKUDS/LightRAG"},{"type":"PACKAGE","url":"https://pypi.org/project/lightrag-hku"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-mcww-4hxq-hfr3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30762"}],"affected":[{"package":{"name":"lightrag-hku","ecosystem":"PyPI","purl":"pkg:pypi/lightrag-hku"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.13"}]}],"versions":["0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9","1.0.0","1.0.1","1.0.3","1.0.5","1.0.6","1.0.8","1.0.9","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.2.1","1.2.2","1.2.3","1.2.5","1.2.6","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.1","1.4.10","1.4.11","1.4.11rc2","1.4.12","1.4.12rc1","1.4.13rc1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8.1","1.4.8.2","1.4.8rc4","1.4.8rc6","1.4.8rc7","1.4.8rc8","1.4.8rc9","1.4.9","1.4.9.1","1.4.9.10","1.4.9.11","1.4.9.2","1.4.9.3","1.4.9.4","1.4.9.4rc1","1.4.9.5","1.4.9.6","1.4.9.7","1.4.9.8","1.4.9.9","1.4.9rc1","1.4.9rc2","1.4.9rc3","1.4.9rc4"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/lightrag-hku/PYSEC-2026-2593.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}