BlueprintUE Self-Hosted Edition up to 4.3.3 Login Middleware LoginMiddleware.php excessive authentication

Summaryinfo

A vulnerability was found in BlueprintUE Self-Hosted Edition up to 4.3.3. It has been declared as problematic. This vulnerability affects unknown code of the file LoginMiddleware.php of the component Login Middleware. Such manipulation leads to excessive authentication. This vulnerability is uniquely identified as CVE-2026-122138. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in BlueprintUE Self-Hosted Edition up to 4.3.3. Affected by this issue is some unknown processing of the file LoginMiddleware.php of the component Login Middleware. The manipulation with an unknown input leads to a excessive authentication vulnerability. Using CWE to declare the problem leads to CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-122138 since 11/04/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1110.001.

By approaching the search of inurl:LoginMiddleware.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.3.4 eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• BlueprintUE

Name

• Self-Hosted Edition

Version

• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3

CPE 2.3info

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CPE 2.2info

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