CVE-2026-40586: high-severity vulnerability in blueprintue-self-hosted-edition
blueprintUE: Login Endpoint Has No Rate Limiting, Lockout, or Brute-Force Protection
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
blueprintUE is a tool to help Unreal Engine developers. Prior to 4.2.0, the login form handler performs no throttling of any kind. Failed authentication attempts are processed at full network speed with no IP-based rate limiting, no per-account attempt counter, no temporary lockout, no progressive delay (Tarpit), and no CAPTCHA challenge. An attacker can submit an unlimited number of credential guesses. The password policy (10+ characters, mixed case, digit, special character) reduces the effective keyspace but does not prevent dictionary attacks, credential stuffing from breached databases, or targeted attacks against known users with predictable passwords. This vulnerability is fixed in 4.2.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
blueprintue · blueprintue-self-hosted-editionRelated CVEs — blueprintue-self-hosted-edition
In the same product, most dangerous first.
CVE-2026-122139MEDIUMblueprintUE Self-Hosted Edition before 4.3.3 Account Enumeration via Password ResetEPSS 0.3%CVE-2026-122138MEDIUMBlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 Login Rate Limit BypassEPSS 0.3%CVE-2026-40588HIGHblueprintUE: Authenticated Password Change Does Not Verify Current PasswordEPSS 0.3%CVE-2026-40585HIGHblueprintUE: Password Reset Tokens Have No Expiry WindowEPSS 0.3%CVE-2026-40587MEDIUMblueprintUE: Active Sessions Are Not Invalidated After Password Change or ResetEPSS 0.2%CVE-2026-121735MEDIUMblueprintUE Self-Hosted Edition before 4.3.4 Non-Expiring Account Confirmation TokensEPSS 0.2%