Authentication Bypass Vulnerability in blueprintUE Tool for Unreal Engine Developers
CVE-2026-40586

7.5HIGH

Key Information:

Vendor

Blueprintue

Status
Blueprintue-self-hosted-edition
Vendor
CVE Published:
21 April 2026

What is CVE-2026-40586?

The blueprintUE tool, designed for Unreal Engine developers, contains a significant vulnerability that allows attackers to perform unlimited login attempts without any form of throttling. This lack of IP-based rate limiting and failure counters exposes users to dictionary attacks, credential stuffing, and targeted login attempts against accounts using easily guessable passwords. The security flaw persists in versions prior to 4.2.0, but it has been addressed in the latest release. To ensure the safety of your application and user credentials, it is vital to update to version 4.2.0 or later.

Affected Version(s)

blueprintue-self-hosted-edition < 4.2.0

References

https://github.com/blueprintue/blueprintue-self-hosted-ed...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.