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BDVDB
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Vulnerabilities

CVE-2026-120999 | BDVDB-2026-402799 Detail

nerves-hubnerves_hub_web

Description#

Improper Authentication vulnerability in Google sign-in and email confirmation in nerves-hub nerves_hub_web allows an attacker who registers another person's email address to share that person's account once they sign in. NervesHub.Accounts.update_or_create_user_from_ueberauth/1 signs a Google user in to any account carrying the same email that is not yet linked to a Google account, links it and marks the email confirmed, without the account's owner ever having proved they own the address. NervesHubWeb.SessionController.confirm/2 likewise signs in whoever follows a confirmation link. An attacker registers the address from the sign-up form, changes their own account's email to it, or registers it as an organization admin from an invite link, and keeps the password; when the address's owner signs in with Google or follows the confirmation link, they land in that account. The Google path also creates accounts with registrations closed and never checks Google's email_verified claim, and the API's password sign-in in NervesHubWeb.API.UserController issues tokens to accounts whose email was never confirmed. The attacker gains only what the victim is granted afterwards, and nothing on accounts whose owners never use either path. This issue affects nerves_hub: from 2.3.0 before 2.5.3.

Impact#

An attacker who registers someone else's email address before that person first signs in with Google, or before they follow a confirmation link, ends up sharing that person's account: the attacker keeps signing in with the password they chose and sees and does whatever the victim can, in every organization the victim joins, at the victim's role. On an account linked to Google the victim cannot reset the password to lock the attacker out.

Weaknesses#

  • CWE-287 Improper Authentication
  • CWE-345 Insufficient Verification of Data Authenticity

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.