---
id: CVE-2026-30762
aliases:
  - GHSA-mcww-4hxq-hfr3
  - PYSEC-2026-2593
title: 'LightRAG: Hardcoded JWT Signing Secret Allows Authentication Bypass'
summary: 'LightRAG: Hardcoded JWT Signing Secret Allows Authentication Bypass'
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
vendor: lightrag-hku
product: lightrag-hku
ecosystem: pip
affected:
  - lightrag-hku < 1.4.13
patched:
  - lightrag-hku 1.4.13
published: '2026-04-04'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-mcww-4hxq-hfr3'
references:
  - url: 'https://github.com/HKUDS/LightRAG/security/advisories/GHSA-mcww-4hxq-hfr3'
  - url: 'https://github.com/HKUDS/LightRAG'
tags:
  - osv
  - pip
ingestedAt: '2026-07-13T18:58:00.588Z'
---

## Overview

Subject: Security Vulnerability Report Hardcoded JWT Secret (CVE-2026-30762)

Hi HKUDS team,

I'm writing to report a security vulnerability I discovered in LightRAG v1.4.10. This has been assigned CVE-2026-30762 by MITRE.

Vulnerability: Hardcoded JWT signing secret
Type: Improper Authentication (CWE-287)
Severity: High
Attack Vector: Remote / Unauthenticated

Summary:
The 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.

Reproduction:
1. Install LightRAG v1.4.10 with AUTH_ACCOUNTS configured but no TOKEN_SECRET set
2. Use PyJWT to sign a token: jwt.encode({"sub": "admin", "role": "user"}, "lightrag-jwt-default-secret", algorithm="HS256")
3. Send a request to any protected endpoint with the header: Authorization: Bearer <forged_token>
4. Access is granted without valid credentials

Suggested Fix:
Require 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.

I'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.

Best regards,
Venkata Avinash Taduturi

## Affected packages

- `lightrag-hku < 1.4.13`

## Remediation

Upgrade to a patched release:

- `lightrag-hku 1.4.13`