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TI-2026-29323 Aliases CVE-2026-40587

blueprintUE: Active Sessions Are Not Invalidated After Password Change or Reset

Priority MEDIUM 64CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

blueprintUE is a tool to help Unreal Engine developers. Prior to 4.2.0, when a user changes their password via the profile edit page, or when a password reset is completed via the reset link, neither operation invalidates existing authenticated sessions for that user. A server-side session store associates userID → session; the current password change/reset flow updates only the password column in the users table and does not destroy or mark invalid any active sessions. As a result, an attacker who has already compromised a session retains full access to the account indefinitely — even after the legitimate user has detected the intrusion and changed their password — until the session's natural expiry time (configured as SESSION_GC_MAXLIFETIME, defaulting to 86400 seconds / 24 hours, with SESSION_LIFETIME=0 meaning persistent until browser close or GC, whichever is later). This vulnerability is fixed in 4.2.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00242 15th percentileScored 2026-11-07
Fix Fixed blueprintue-self-hosted-edition (blueprintue): 4.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
blueprintueblueprintue-self-hosted-editionbefore 4.2.04.2.0Patch availableCNA
  • blueprintue-self-hosted-edition Vendorblueprintue Affected before 4.2.0 Fixed in 4.2.0 Patch available CNA

Remediation

  • Fix · CNA blueprintue-self-hosted-edition (blueprintue) Fixed in 4.2.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40587

References

Other 1

  • TI-2026-29322 blueprintUE: Login Endpoint Has No Rate Limiting, Lockout, or Brute-Force Protection CVSS 3.1HIGH 7.5
  • TI-2026-29324 blueprintUE: Authenticated Password Change Does Not Verify Current Password CVSS 3.1HIGH 8.1
  • TI-2026-29321 blueprintUE: Password Reset Tokens Have No Expiry Window CVSS 3.1HIGH 7.4
  • TI-2026-85180 Account enumeration via password reset in blueprintUE Self-Hosted Edition CVSS 4.0MEDIUM 6.9
  • TI-2026-85179 Login rate limit bypass in BlueprintUE Self-Hosted Edition CVSS 4.0MEDIUM 6.3
  • TI-2026-84856 Stale confirmation tokens activate accounts in blueprintUE Self-Hosted Edition CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences