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CVE-2026-40586— blueprintUE: Login Endpoint Has No Rate Limiting, Lockout, or Brute-Force Protection

Quick assessment

Affected
blueprintue blueprintue-self-hosted-edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

blueprintUE self-hosted edition是blueprintUE开源的一个自托管的数据建模与可视化工具。 blueprintUE self-hosted edition 4.2.0之前版本存在安全漏洞，该漏洞源于登录表单处理程序未执行任何类型的限制，可能导致攻击者以全网络速度提交无限数量的凭据猜测，进行字典攻击、凭据填充或针对已知用户的定向攻击。

CVSS 7.5 · High EPSS 0.37% · P31

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force
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I. Basic Information for CVE-2026-40586

Vulnerability Information
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Vulnerability Title
blueprintUE: Login Endpoint Has No Rate Limiting, Lockout, or Brute-Force Protection
Source: CVE Program / CVE List V5
Vulnerability Description
blueprintUE is a tool to help Unreal Engine developers. Prior to 4.2.0, the login form handler performs no throttling of any kind. Failed authentication attempts are processed at full network speed with no IP-based rate limiting, no per-account attempt counter, no temporary lockout, no progressive delay (Tarpit), and no CAPTCHA challenge. An attacker can submit an unlimited number of credential guesses. The password policy (10+ characters, mixed case, digit, special character) reduces the effective keyspace but does not prevent dictionary attacks, credential stuffing from breached databases, or targeted attacks against known users with predictable passwords. This vulnerability is fixed in 4.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
blueprintUE self-hosted edition 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
blueprintUE self-hosted edition是blueprintUE开源的一个自托管的数据建模与可视化工具。 blueprintUE self-hosted edition 4.2.0之前版本存在安全漏洞，该漏洞源于登录表单处理程序未执行任何类型的限制，可能导致攻击者以全网络速度提交无限数量的凭据猜测，进行字典攻击、凭据填充或针对已知用户的定向攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
blueprintue blueprintue-self-hosted-edition < 4.2.0 -

II. Public POCs for CVE-2026-40586

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III. Intelligence Information for CVE-2026-40586

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Vendor Advisories for CVE-2026-40586 (1)

Same Patch Batch · blueprintue · 2026-04-21 · 4 CVEs total

CVE-2026-40588 8.1 HIGH blueprintUE: Authenticated Password Change Does Not Verify Current Password
CVE-2026-40585 7.4 HIGH blueprintUE: Password Reset Tokens Have No Expiry Window
CVE-2026-40587 6.5 MEDIUM blueprintUE: Active Sessions Are Not Invalidated After Password Change or Reset

IV. Related Vulnerabilities

Same product: blueprintue-self-hosted-edition
Same vendor: blueprintue
Same weakness: CWE-307