CVE-2026-40587

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{"affected": [{"affectedData": [{"product": "blueprintue-self-hosted-edition", "vendor": "blueprintue", "versions": [{"status": "affected", "version": "< 4.2.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 \u2192 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 \u2014 even after the legitimate user has detected the intrusion and changed their password \u2014 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."}, {"lang": "es", "value": "blueprintUE es una herramienta para ayudar a los desarrolladores de Unreal Engine. Antes de la 4.2.0, cuando un usuario cambia su contrase\u00f1a a trav\u00e9s de la p\u00e1gina de edici\u00f3n de perfil, o cuando se completa un restablecimiento de contrase\u00f1a a trav\u00e9s del enlace de restablecimiento, ninguna de las operaciones invalida las sesiones autenticadas existentes para ese usuario. Un almac\u00e9n de sesiones del lado del servidor asocia userID ? sesi\u00f3n; el flujo actual de cambio/restablecimiento de contrase\u00f1a actualiza solo la columna de contrase\u00f1a en la tabla de usuarios y no destruye ni marca como inv\u00e1lida ninguna sesi\u00f3n activa. Como resultado, un atacante que ya ha comprometido una sesi\u00f3n retiene acceso completo a la cuenta indefinidamente - incluso despu\u00e9s de que el usuario leg\u00edtimo haya detectado la intrusi\u00f3n y cambiado su contrase\u00f1a - hasta el tiempo de caducidad natural de la sesi\u00f3n (configurado como SESSION_GC_MAXLIFETIME, con un valor predeterminado de 86400 segundos / 24 horas, con SESSION_LIFETIME=0 significando persistente hasta el cierre del navegador o GC, lo que ocurra m\u00e1s tarde). Esta vulnerabilidad se corrige en la 4.2.0."}], "id": "CVE-2026-40587", "lastModified": "2026-10-26T00:10:00.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40587", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-21T19:59:20.313580Z", "version": "2.0.3"}}]}, "published": "2026-04-21T18:16:51.073", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-gqpq-x62g-p4mg"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-gqpq-x62g-p4mg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-613"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "blueprintue-self-hosted-edition", "source": "cna", "vendor": "blueprintue"}, "product": "blueprintue-self-hosted-edition", "vendor": "blueprintue"}], "analysis": {"en": {"generated_at": "2026-04-21T22:32:58.280829+00:00", "value": {"mitigation_remediation": ["Upgrade to blueprintUE version 4.2.0 or later, where active sessions are invalidated on password change or reset.", "If an upgrade is not immediately possible, manually clear all user sessions from the session store to terminate compromised tokens.", "Consider lowering the SESSION_GC_MAXLIFETIME parameter or configuring sessions to be terminated at password change via custom patch, ensuring future sessions do not persist beyond a reasonable timeframe."], "summary": {"action": "Patch Now", "impact": "Account Compromise Persistence"}, "threat_synthesis": {"affected_systems": "All installations of blueprintUE self-hosted edition older than version 4.2.0 are impacted; the vulnerability is fixed in 4.2.0.", "description_and_impact": "The flaw lies in the session management mechanism of blueprintUE. When a user changes their password or completes a reset through the web interface, the current session store continues to reference the existing session tokens. Consequently, any actor who has already hijacked a session remains fully authenticated until that session is naturally discarded, typically after 24 hours or when the browser is closed. This allows repeated unauthorized access to the user's account after the legitimate owner has taken remedial action, effectively turning temporary credential theft into persistent state. The weakness is classified as CWE-613, indicating that session invalidation is omitted after a password change.", "risk_and_exploitability": "The CVSS score is 6.5, indicating a medium severity that could lead to persistent account compromise. EPSS is not reported, and the vulnerability is not listed in CISA's KEV catalog. The attack vector is inferred to be remote, requiring an attacker to possess a valid session cookie, which could be obtained through typical credential theft or other session hijacking techniques. Once a session is hijacked, the vulnerability allows it to remain active indefinitely, raising the risk of long-term unauthorized access. Even with session timeout policies, the window of exposure expands to the full GC lifetime or browser lifetime."}}}}, "created": "2026-04-21T22:45:16.048316+00:00", "updated": "2026-04-22T11:46:02.928380+00:00", "vendors": ["blueprintue", "blueprintue$PRODUCT$blueprintue-self-hosted-edition"]}