Vulnerability details

CVE-2026-61740

HKUDS LightRAG

LightRAG: Authentication bypass: hardcoded DEFAULT_TOKEN_SECRET and public /auth-status defeat LIGHTRAG_API_KEY protection

CVSS 4.0

9.3Critical

Official 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 scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
HKUDS	LightRAG	< 1.5.4	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-07-15
Last updated: 2026-07-15
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.5%

Probability of exploitation in 30 days

43.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-287
Improper Authentication
CWE-798
Use of Hard-coded Credentials