Insufficiently Random Value Vulnerability in open-webui by Unknown Vendor
CVE-2025-15603

6.3MEDIUM

Key Information:

Vendor

Unknown Vendor

Status
Open-webui
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-15603?

A security vulnerability has been identified in the open-webui product, specifically affecting the JWT Key Handler component. The issue emerges from a flaw in the backend/start_windows.bat file where manipulation of the WEBUI_SECRET_KEY leads to insufficiently random values. This weakness has the potential to be exploited remotely; however, the complexity of the exploit is considered high, making direct exploitation challenging. Public disclosure of the exploit raises concerns, urging users to implement necessary security measures promptly.

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Affected Version(s)

open-webui 0.6.0

open-webui 0.6.1

open-webui 0.6.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-15603 - Proof of Concept

References

https://vuldb.com/?id.349701
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349701
signaturepermissions-required
https://vuldb.com/?submit.766444
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

I4m6da (VulDB User)
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