WWBN AVideo is an open source video platform. In 29.0 and earlier, there is a stored cross-site scripting vulnerability. The Live plugin's "YouTube-style" view renders the live transmission's stream key into an HTML class attribute by raw echo, without htmlspecialchars(). A canStream user can persist a key containing " plus an event handler via plugin/Live/saveLive.php, and any visitor (logged in or anonymous) opening the stream's live page executes attacker JavaScript in the platform origin.

Affected: Packagist: WWBN/AVideo

## Summary

**Type:** Stored cross-site scripting. The Live plugin's "YouTube-style" view renders the live transmission's stream key into an HTML class attribute by raw `echo`, without `htmlspecialchars()`. A `canStream` user can persist a key containing `"` plus an event handler via `plugin/Live/saveLive.php`, and any visitor (logged in or anonymous) opening the stream's live page executes attacker JavaScript in the platform origin. **File:** `plugin/Live/view/modeYoutubeLive.php`, line 203. **Root cause:** the template builds a live-status hook by concatenating the database key into a class name: `class="title_liveKey_<?php echo $livet['key'] ?>"`. There is no escaping. The persistence path `plugin/Live/saveLive.php:30` accepts `$_REQUEST['key']` verbatim into `live_transmitions.key` (the auto-generation path uses `uniqid()`, but the manual save path lets the caller override it with anything). The `on_publish.php:117` sanitiser strips only `&` and `=`, not `"`, `<`, or `>`, so the poisoned value also passes through every internal data flow. The admin-side rendering of the same field is similarly unescaped, so an admin opening the stream details page gets the same XSS in admin context.

## Affected Code

**File:** `plugin/Live/view/modeYoutubeLive.php`, lines 195-209.

```php <i class="fas fa-lock"></i> <?php } else { ?> <i class="fas fa-video"></i…