Bug 2569529 (CVE-2026-120997)

Summary: CVE-2026-120997 nerves_hub_web: nerves_hub_web: privilege escalation via improper session invalidation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in nerves_hub_web. This vulnerability allows an authenticated user to perform unauthorized actions and maintain elevated privileges after their account permissions have been reduced or revoked. Due to improper session invalidation, active dashboard pages, local shells, and device console sessions do not re-verify authorization status upon role changes, allowing continued execution of commands. Additionally, device console authentication tokens are not revoked upon sign-out, allowing ongoing access until the tokens expire.
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Description OSIDB Bzimport 2026-11-10 13:00:42 UTC 
Improper Session Invalidation vulnerability in the dashboard pages, device console and local shell channels in nerves-hub nerves_hub_web allows an organization member who is removed or given a lower role to keep acting at their old role through anything they had open at the time. The dashboard reads the member's role once when a page mounts, in the assign_org_to_scope hook of NervesHubWeb.Auth, and the console, local shell and device event stream channels check membership once at join. Removing a member or changing their role tells none of them, so open pages keep carrying out actions and open consoles keep running commands on the device until the page reloads or the socket disconnects.

The dashboard also opens consoles over NervesHubWeb.UserSocket with a token that holds only the user's id, is accepted for 24 hours, and is not revoked by signing out, which disconnects only the session's LiveViews. Whoever holds a token taken from a page can open consoles as that user, within the user's current membership, until it expires.

This issue affects nerves_hub: from 1.0.0 before 2.5.3.