Vulnerability details

Session Fixation vulnerability in the CLI login flow in nerves-hub nerves_hub_web allows an unauthenticated attacker to obtain an API token for another user's account via a crafted login link. Starting a CLI login with POST /api/auth/cli_session needs no authentication and returns a polling token, a confirmation URL that carries that token, and a confirmation code. When a signed-in user opens that URL and clicks Confirm, NervesHub.Accounts.verify_cli_session_token/2 creates an API token for the user's account and stores it on the login, and the next poll of GET /api/auth/cli_session/<token> returns it to whoever started the login. The confirmation code is only displayed and is never compared with anything, so it cannot show that the person confirming is the one who started the login. The confirm form carries a CSRF token and the page cannot be framed, so the attacker has to persuade the user to open the link and click the button themselves. This issue affects nerves_hub: from 2.5.0 before 2.5.3.

• https://github.com/nerves-hub/nerves_hub_web/security/advisories/GHSA-9vr9-463q-46qp vendor-advisoryrelated
• https://cna.erlef.org/cves/CVE-2026-119446.html related
• https://osv.dev/vulnerability/EEF-CVE-2026-119446 related
• https://github.com/nerves-hub/nerves_hub_web/commit/e6bf11a812d7aa8b69d854ba8ef02d65516f5564 related
• https://github.com/nerves-hub/nerves_hub_web/commit/3131f1701194b581ab4b3e5e9d81194fc9c83508 patch