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The vulnerability stems from unescaped user input in login error messages. The commit diff shows the vulnerability was patched by adding htmlspecialchars() around the $nick variable in AppController::userAuth. This function handles authentication and directly used user-controlled input (fsNick parameter) in a warning message without proper output encoding, making it the clear injection point for reflected XSS attacks when rendering error messages to users.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| facturascripts/facturascripts | composer | < 2022.06 | 2022.06 |