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GHSA-mcww-4hxq-hfr3

HighCVSS 7.5 / 10
Published Apr 4, 2026·Last modified Apr 6, 2026
Affected Components(0)

No affected components available

Description

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

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-30762
    Alias

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High severity
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