CVE-2026-63437
2FAuth: Missing Authorization on Share Recipients Endpoint Allows Cross-User Account Enumeration
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| 2FAuth Bubka |
< 8.0.0 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/Bubka/2FAuth/security/advisories/GHSA-m52c-63g8-qg5cCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/Bubka/2FAuth/commit/08753afbd847da8fa285e2ad857693ff88e46b84CNA: GitHub_M · x_refsource_MISC
- https://github.com/Bubka/2FAuth/releases/tag/v8.0.0CNA: GitHub_M · x_refsource_MISC
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