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The vulnerability stems from insufficient sanitization when generating message previews in the conversation overview. The commit diff shows the patch added a check for '<' characters in the messagePreview variable derived from lastMessage.text. Prior to this fix, the code returned the text content without validating against HTML/script tags, making it possible for XSS payloads to execute when rendered. The vulnerable logic resides in the message drawer's overview section processing, specifically in the handling of lastMessage.text content.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| moodle/moodle | composer | = 3.8 | 3.8.1 |
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