nerves-hub nerves_hub_web up to 2.5.2 CLI Login Flow /api/auth/cli_session NervesHub.Accounts.verify_cli_session_token session fixiation

Summaryinfo

A vulnerability, which was classified as critical, was found in nerves-hub nerves_hub_web up to 2.5.2. This issue affects the function NervesHub.Accounts.verify_cli_session_token of the file /api/auth/cli_session of the component CLI Login Flow. Executing a manipulation can lead to session fixiation. The identification of this vulnerability is CVE-2026-119446. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in nerves-hub nerves_hub_web up to 2.5.2 and classified as critical. This vulnerability affects the function NervesHub.Accounts.verify_cli_session_token of the file /api/auth/cli_session of the component CLI Login Flow. The manipulation with an unknown input leads to a session fixiation vulnerability. The CWE definition for the vulnerability is CWE-384. Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-119446 since 11/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 2.5.3 eliminates this vulnerability.

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Productinfo

Vendor

• nerves-hub

Name

• nerves_hub_web

Version

• 2.5.0
• 2.5.1
• 2.5.2

Website

• Product: https://github.com/nerves-hub/nerves_hub_web/

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