CVE-2026-122138

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

6.3 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.33%Unchanged since Nov 5, 2026

What each source reports

CVE List Score used 6.3

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

Record: CVE-2026-122138
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-307
Updated: 2026-11-04

EUVDEUVD-2026-117092 6.3

Record: EUVD-2026-117092
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-05

GitHub AdvisoriesGHSA-3x4w-vq7f-5f76 6.3

BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 contains a login rate limit bypass...

Record: GHSA-3x4w-vq7f-5f76
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-307
Updated: 2026-11-04

NVD 6.3

Record: CVE-2026-122138
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-307
Updated: 2026-11-04

OSV 6.3

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

Record: CVE-2026-122138
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-307
Updated: 2026-11-05

Affected products

blueprintue blueprintue-self-hosted-edition

History

History
Recorded	Changed	Sources
Nov 5, 2026	aliases, references	OSV
Nov 5, 2026	published	EUVD
Nov 4, 2026	published	EUVD, NVD
Nov 4, 2026	aliases, published	EUVD
Nov 4, 2026	first indexed	CVE List, GitHub Advisories

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-122138 is a medium vulnerability (CVSS 6.3) in Blueprintue Blueprintue-self-hosted-edition, published November 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.

References

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