---
id: CVE-2026-122138
title: BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 Login Rate Limit Bypass
summary: >-
  BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 contains a login rate limit
  bypass vulnerability in LoginMiddleware.php that keys failed-login counters on
  case-sensitive usernames. Unauthenticated attackers can vary username casing
  ag…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-307
vendor: blueprintue
product: blueprintue-self-hosted-edition
affected:
  - blueprintue-self-hosted-edition >= 4.2.0 < 4.3.4
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T20:36:55.818Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122138'
references:
  - url: >-
      https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-773r-585g-6vc3
    label: GitHub Security Advisory (GHSA-773r-585g-6vc3)
  - url: >-
      https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/bd4af38d2f7d499be23fc4106f93980a1348ddd7
  - url: 'https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/267'
  - url: >-
      https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.4
    label: blueprintue-self-hosted-edition v4.3.4 Release Notes
  - url: >-
      https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.3/app/middlewares/LoginMiddleware.php#L119-L158
  - url: >-
      https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-4.2.0-before-4.3.4-login-rate-limit-bypass
    label: >-
      VulnCheck Advisory: BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4
      Login Rate Limit Bypass
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.566Z'
---

## Overview

BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 contains a login rate limit bypass vulnerability in LoginMiddleware.php that keys failed-login counters on case-sensitive usernames. Unauthenticated attackers can vary username casing against case-insensitive MySQL lookups to get extra attempts and brute-force passwords past the per-account lockout.

## Affected

- `blueprintue-self-hosted-edition >= 4.2.0 < 4.3.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.