GHSA-mj2c-8hxf-ffvq

### Summary  A command echoing feature in the framework allows users to indirectly trigger privileged behavior by injecting special platform tags. Specifically, an unauthorized user can use the `/echo <qqbot-at-everyone />` command to cause the bot to send a message that mentions all members in the chat, bypassing any permission controls. This can lead to spam, disruption, or abuse of notification systems.  ### Details  The framework provides a command `/echo` that causes the bot to repeat any user-provided message verbatim in the group chat. However, the bot fails to sanitize or filter platform-specific control elements such as `<qqbot-at-everyone />`, which, when included in a message, mentions everyone (i.e., @全体成员). While normal users are forbidden from using this tag in normal chats, the bot, which has higher privileges, is allowed to do so.  Since the `/echo` command blindly echoes any content, a user can exploit this by sending:  ``` /echo <qqbot-at-everyone /> ```  The bot will then send a message containing `<qqbot-at-everyone />`, causing the platform to interpret it as an @全体成员 command, effectively allowing an unauthorized user to @everyone via the bot.  ### PoC  1. Set up a chatbot using the affected framework. 2. Join the chat that includes the bot as a regular user with **no permission to use @全体成员**. 3. Send the following message in the chat:  ``` /echo <qqbot-at-everyone /> ``` 4. The bot will respond by repeating the message, and the platform will interpret `<qqbot-at-everyone />` as an @全体成员 mention. 5. All the chat members receive a notification, despite the user lacking that permission.