CVE-2026-119446 Session fixation in the CLI login flow allows an unauthenticated attacker to obtain a user's API token
- Published
- Updated
- Exploit status
- No public exploit known
Description
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nerves-hub nerves hub web | >= 2.5.0, < 2.5.3 | 2.5.3 |
| nerves-hub nerves hub web | >= e6bf11a812d7aa8b69d854ba8ef02d65516f5564, < 3131f1701194b581ab4b3e5e9d81194fc9c83508 | 3131f1701194b581ab4b3e5e9d81194fc9c83508 |
References
- CLI login links give an API token to whoever sent them related vendor-advisory
- EEF CNA record for CVE-2026-119446 related
- OSV record EEF-CVE-2026-119446 related
- Introducing commit e6bf11a in nerves-hub/nerves_hub_web related
- Fix commit 3131f17 in nerves-hub/nerves_hub_web patch