---
cve: "CVE-2026-61740"
severity: "CRITICAL"
cvss: 9.3
epss: "0.7%"
vendor: "HKUDS"
kev: false
exploited: false
published: "2026-07-15 15:16:48"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T06:06:46+02:00"
---

# CVE-2026-61740

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- f7819aa3a49a9d8d92eed8251d82d6ebcafa8cba (Commit)
- 9a45b64c2ee25b1d806e90db926a8af37480bb16 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-61740) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_