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Vulnerability record · CVE-2026-61740 · published 15 July 2026

CVE-2026-61740: Improper authentication vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.66% · top 50.3% CWE-287 · Improper authenticationCWE-798 · Hard-coded credentials Deferred
9.3CVSS 4.0 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
15 Jul 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/HKUDS/LightRAG/commit/f7819aa3a49a9d8d92eed8251d82d6ebcafa8cba
https://github.com/HKUDS/LightRAG/pull/3319
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.4
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789

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Source: NIST National Vulnerability Database (record CVE-2026-61740), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.