CVE-2026-122138

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-307
Vendor	blueprintue
Product	blueprintue-self-hosted-edition
Published	Nov 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

blueprintue / blueprintue-self-hosted-edition

4.2.0 < 4.3.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Farhan Khan rancoud