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EUVD-2026-277122

2026-10-15T21:38:15.188957+00:00

EUVD-2026-277122

fkie_cve-2026-33650

2026-10-15T21:38:15.188993+00:00

WWBN AVideo is an open source video platform. In versions up to and including 26.0, a user with the "Videos Moderator" permission can escalate privileges to perform full video management operations — including ownership transfer and deletion of any video — despite the permission being documented as only allowing video publicity changes (Active, Inactive, Unlisted). The root cause is that `Permissions::canModerateVideos()` is used as an authorization gate for full video editing in `videoAddNew.json.php`, while `videoDelete.json.php` only checks ownership, creating an asymmetric authorization boundary exploitable via a two-step ownership-transfer-then-delete chain. Commit 838e16818c793779406ecbf34ebaeba9830e33f8 contains a patch.

GHSA-8x77-f38v-4m5j — AVideo: Video Moderator Privilege Escalation via Ownership Transfer Enables Arbitrary Video Deletion

2026-10-15T21:38:15.189033+00:00

Affected: Packagist: wwbn/avideo

## Summary

A user with the "Videos Moderator" permission can escalate privileges to perform full video management operations — including ownership transfer and deletion of any video — despite the permission being documented as only allowing video publicity changes (Active, Inactive, Unlisted). The root cause is that `Permissions::canModerateVideos()` is used as an authorization gate for full video editing in `videoAddNew.json.php`, while `videoDelete.json.php` only checks ownership, creating an asymmetric authorization boundary exploitable via a two-step ownership-transfer-then-delete chain.

## Details

The `PERMISSION_INACTIVATEVIDEOS` (ID 11) permission is described as a limited moderator role in `plugin/Permissions/Permissions.php:213`:

```php $permissions[] = new PluginPermissionOption( Permissions::PERMISSION_INACTIVATEVIDEOS, __('Videos Moderator'), __('This is a level below the (Videos Admin), this type of user can change the video publicity (Active, Inactive, Unlisted)'), 'Permissions' ); ```

However, `Permissions::canModerateVideos()` (`Permissions.php:175`) is reused as an authorization gate in multiple locations in `videoAddNew.json.php` that go far beyond status changes:

**1. Upload gate bypass** (`videoAddNew.json.php:10`): `User::canUpload()` (`user.php:2650`) returns `true` if `Permissions::canModerateVideos()` is true, granting moderators upload access.

**2. Edit gate bypass** (`videoAddNew.json.php:19`): ```php if (!Video::canEdit($_…