Medium severity5.3NVD Advisory· Published Nov 4, 2026
CVE-2026-122138
CVE-2026-122138
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.
Affected products
1- Range: <4.3.4
Patches
Vulnerability mechanics
References
6- github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.3/app/middlewares/LoginMiddleware.phpnvd
- github.com/blueprintue/blueprintue-self-hosted-edition/commit/bd4af38d2f7d499be23fc4106f93980a1348ddd7nvd
- github.com/blueprintue/blueprintue-self-hosted-edition/pull/267nvd
- github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.4nvd
- github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-773r-585g-6vc3nvd
- www.vulncheck.com/advisories/blueprintue-self-hosted-edition-4.2.0-before-4.3.4-login-rate-limit-bypassnvd
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