EUVD-2026-61484Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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
Network-reachable API requires only a valid HA user session (PR:L); scope is unchanged as all impact is confined to the HA installation itself.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
4DescriptionCVE.org
Blueprint Studio is a VS Code-like file editor for Home Assistant configuration files. Prior to 2.5.2, Blueprint Studio exposed administrator-intended backend API actions to any authenticated Home Assistant user because the backend did not consistently enforce the panel's admin-only authorization boundary. Affected surfaces included the backend API, upload API, stream routes, terminal WebSocket, Blueprint Studio WebSocket subscriptions, call_service, render_template, global_replace, file and stream access paths, upload handling, and terminal helpers. A non-admin user could invoke arbitrary Home Assistant services, expose Home Assistant state through templates, modify configuration files, access streamed or downloaded configuration content, upload files, or reach terminal-related helpers. These actions could compromise the confidentiality, integrity, and availability of the Home Assistant installation. This issue is fixed in version 2.5.2.
AnalysisAI
Privilege escalation in Blueprint Studio (versions prior to 2.5.2) allows any authenticated Home Assistant user to access and invoke administrator-only backend API actions - including arbitrary Home Assistant service calls, configuration file reads and writes, template rendering, file uploads, and terminal helper access - because the Python backend in api.py authenticated requests for valid HA user identity but never verified admin status. The fix in 2.5.2, released 2026-05-26, introduces a consistent _require_admin() guard across all GET, POST, stream, upload, and WebSocket handlers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid non-admin Home Assistant user account - any authenticated HA user who is not flagged as an administrator in the HA user management interface can exploit this. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H accurately characterizes the risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Blueprint Studio to version 2.5.2 or later, released 2026-05-26. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Blueprint Studio deployments and document current version numbers; immediately restrict access to Blueprint Studio to trusted, authorized users only and enforce strong authentication. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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