CVE-2026-33035 Unauthenticated Reflected XSS via innerHTML in AVideo
Unauthenticated attackers can execute arbitrary JavaScript via reflected XSS in AVideo, leading to session theft and account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33035?
CVE-2026-33035 is a medium-severity cross-site scripting vulnerability in Wwbn Avideo, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-33035?
2 open source packages ship an affected version, including wwbn/avideo. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wwbn/avideo Packagist | All versions to 25.0 | None |
wwbn/avideo Packagist | All versions to 25.0 | None |
Products include Wwbn Avideo.
How do I fix CVE-2026-33035?
No fix has been published for CVE-2026-33035 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-33035 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33035 exists.
Other vulnerabilities in Wwbn Avideo
- CVE-2026-40911 WWBN AVideo YPTSocket WebSocket Broadcast Relay Leads to Unauthenticated Cross-User JavaScript Execution via Client-Side eval() Sinks
- CVE-2026-33478 AVideo Multi-Chain Attack: Unauthenticated Remote Code Execution via Clone Key Disclosure, Database Dump, and Command Injection
- CVE-2022-30534 Command injection in AVideo
- CVE-2022-30547 Path traversal in AVideo
- CVE-2022-32572 Command injection in AVideo
Sources
Also known as GHSA-wfq5-qgqp-hvhv.