Bubka 2FAuth up to 7.x Account Sharing TwoFAccountShareController.php recipients improper authorization

Summaryinfo

A vulnerability has been found in Bubka 2FAuth up to 7.x and classified as problematic. This vulnerability affects the function recipients of the file app/Api/v1/Controllers/TwoFAccountShareController.php of the component Account Sharing. This manipulation causes improper authorization. This vulnerability is tracked as CVE-2026-63437. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Bubka 2FAuth up to 7.x. Affected by this vulnerability is the function recipients of the file app/Api/v1/Controllers/TwoFAccountShareController.php of the component Account Sharing. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is:

2FAuth is a web app to manage Two-Factor Authentication (2FA) accounts and generate their security codes. Prior to 8.0.0, the recipients() method in app/Api/v1/Controllers/TwoFAccountShareController.php receives a caller-selected TwoFAccount through Laravel model binding but does not call the manageShares authorization policy before listing its recipients. When account sharing is enabled, an authenticated user can call GET /api/v1/twofaccounts/{victimId}/recipients for accounts owned by other users, enumerate registered user IDs and display names, test exact email addresses with filter[nameOrEmail], and inspect each account's sharing relationships. This issue is fixed in version 8.0.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-63437 since 07/16/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

By approaching the search of inurl:app/Api/v1/Controllers/TwoFAccountShareController.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• Bubka

Name

• 2FAuth

Version

• 7.x

Website

• Product: https://github.com/Bubka/2FAuth/

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