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The vulnerability stemmed from unescaped output of user-controlled data in the GraylogController. The patch added htmlspecialchars() to sanitize the 'source' and 'message' fields in the formatMessage method. Since these values originated from external graylog messages (user-controllable input) and were embedded directly into HTML responses without contextual escaping, the pre-patch version of this function was the root cause of the XSS vulnerability.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| librenms/librenms | composer | < 22.4.0 | 22.4.0 |
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