Unauthenticated Reflected XSS via innerHTML in AVideo

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source

EPSS

• CVE-2026-33035: 0.32% estimated exploitation activity in the next 30 days; percentile 25.36 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 jsonencode() 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's jsonencode() 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 innerHTML parses the string as HTML. Any <img, <svg, or other HTML tags with event handlers are instantiated as real DOM elements, triggering JavaScript execution. Data Flow ---…

Published by the source

17 Mar 2026, 20:05 UTC

Last modified by the source

20 Mar 2026, 21:22 UTC

Source last checked

26 Oct 2026, 14:38 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-wfq5-qgqp-hvhv

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# Patch Next advisory brief: CVE-2026-33035

Advisory: Unauthenticated Reflected XSS via innerHTML in AVideo
IDs: CVE-2026-33035, GHSA-wfq5-qgqp-hvhv
Record: https://patchnext.com/advisories/cve-2026-33035 (revision 1, source checked 26 Oct 2026, 14:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist wwbn/avideo: affected <= 25.0

## Suggested inspection (read-only)
- Packagist wwbn/avideo: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on wwbn/avideo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-wfq5-qgqp-hvhv (GitHub-reviewed advisory GHSA-wfq5-qgqp-hvhv lists affected ranges: Packagist wwbn/avideo >=0 <=25.0)

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