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The vulnerability stemmed from using user-supplied 'user_id' in logout operations without proper authorization. The patch replaced 'user_id' with a session-based 'token', indicating the original code used insecure user-controlled keys for authorization decisions. The critical change in logout.php shows the system previously trusted the 'user_id' parameter from GET requests, enabling authorization bypass (CWE-639). The affected files (error.php, load.js.php, logout.php) all migrated from user_id-based to token-based session management, confirming the vulnerable pattern.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| nilsteampassnet/teampass | composer | < 3.0.0.23 | 3.0.0.23 |
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