AVideo Affected by Stored XSS via Unescaped Video Title in CDN downloadButtons.php

Exploitation

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

CVSS 4.0

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

EPSS

• CVE-2026-33295: 0.22% estimated exploitation activity in the next 30 days; percentile 12.53 (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 WWBN/AVideo contains a stored cross-site scripting vulnerability in the CDN plugin's download buttons component. The cleantitle 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: The cleantitle value is echoed verbatim inside a single-quoted JavaScript string literal. No JavaScript-context escaping is applied, such as wrapping with jsonencode 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 cleantitle field is derived from user-supplied video title…

Published by the source

19 Mar 2026, 17:12 UTC

Last modified by the source

25 Mar 2026, 18:35 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-gc3m-4mcr-h3pv

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# Patch Next advisory brief: CVE-2026-33295

Advisory: AVideo Affected by Stored XSS via Unescaped Video Title in CDN downloadButtons.php
IDs: CVE-2026-33295, GHSA-gc3m-4mcr-h3pv
Record: https://patchnext.com/advisories/cve-2026-33295 (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
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-gc3m-4mcr-h3pv (GitHub-reviewed advisory GHSA-gc3m-4mcr-h3pv lists affected ranges: Packagist wwbn/avideo >=0 <=25.0)

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