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EUVD-2026-276667

fkie_cve-2026-33035

WWBN AVideo is an open source video platform. In versions 25.0 and below, there is a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's json_encode() into a JavaScript function that renders it via innerHTML, bypassing encoding and achieving full script execution. The vulnerability is caused by two issues working together: unescaped user input passed to JavaScript (videoNotFound.php), and innerHTML rendering HTML tags as executable DOM (script.js). The attack can be escalated to steal session cookies, take over accounts, phish credentials via injected login forms, spread self-propagating payloads, and compromise admin accounts — all by exploiting the lack of proper input sanitization and cookie security (e.g., missing HttpOnly flag on PHPSESSID). The issue has been fixed in version 26.0.

GHSA-wfq5-qgqp-hvhv — Unauthenticated Reflected XSS via innerHTML in AVideo

Affected: Packagist: wwbn/avideo

## Summary

AVideo contains a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's `json_encode()` into a JavaScript function that renders it via `innerHTML`, bypassing encoding and achieving full script execution.

## Root Cause The vulnerability is caused by two issues working together:

### 1. Source: Unescaped user input passed to JavaScript (videoNotFound.php)

**File:** `view/videoNotFound.php` line 49

```php if (!empty($_REQUEST['404ErrorMsg'])) { echo 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg']) . ');'; } ```

PHP's `json_encode()` with default flags only escapes quotes (`"` → `\"`) and backslashes. It does **NOT** escape HTML special characters (`<`, `>`, `/`). The resulting string contains raw HTML tags that are passed directly to JavaScript.

### 2. Sink: innerHTML renders HTML tags as executable DOM (script.js)

**File:** `view/js/script.js`

```javascript function avideoAlertInfo(msg) { // line ~1891 avideoAlert("", msg, 'info'); // calls ↓ }

function avideoAlert(title, msg, type) { // line ~1270 avideoAlertHTMLText(title, msg, type); // calls ↓ }

function avideoAlertHTMLText(title, msg, type) { // line ~1451 var span = document.createElement("span"); span.innerHTML = msg; // line 1464 — XSS SINK swal({ content: span }); } ```

`innerHTML` parses the string as H…