CVE-2026-61740

Critical

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.

SeverityCritical

CVSS9.3

Exploit probability—

ProductLightrag-hku

PublishedJul 15, 2026

First seenJul 15, 2026

Weakness typeCWE-287Improper authentication CWE-798Hard-coded credentials

How to fix

Update

lightrag-hku1.5.4 or later

Affected products

Product	Affected versions	Fixed in
lightrag-hkuPyPI	v < 1.5.4	1.5.4

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