CVE-2026-122138— BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 Login Rate Limit Bypass

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 4.2.0 至 4.3.4 之前的版本存在登录频率限制绕过漏洞。该漏洞位于 LoginMiddleware.php 文件中，其失败登录计数器以区分大小写的用户名作为键值。未认证的攻击者可通过改变用户名的大小写形式，利用 MySQL 不区分大小写的查询机制，从而获得额外的尝试次数，绕过按账户设置的锁定机制，进而对密码进行暴力破解。

CVSS 5.3 · Medium Updated Nov 05, 2026

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing

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Vulnerability Information

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Vulnerability Title

BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 Login Rate Limit Bypass

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
blueprintue	blueprintue-self-hosted-edition	4.2.0 ~ 4.3.4	-

II. Public POCs for CVE-2026-122138

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-122138

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Other References for CVE-2026-122138 (6)

https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/267 patch issue-tracking
https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.3/app/middlewares/LoginMiddleware.php#L119-L158 technical-description
https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/bd4af38d2f7d499be23fc4106f93980a1348ddd7 patch
https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-773r-585g-6vc3 vendor-advisory
https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.4 release-notes
https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-4.2.0-before-4.3.4-login-rate-limit-bypass third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-122138

IV. Related Vulnerabilities

Same product: blueprintue-self-hosted-edition

Same vendor: blueprintue

Same weakness: CWE-307