AVideo: Remote Code Execution via PHP Temp File in Encoder downloadURL

Exploitation

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

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-33717: 0.40% estimated exploitation activity in the next 30 days; percentile 34.54 (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 The downloadVideoFromDownloadURL() function in objects/aVideoEncoder.json.php saves remote content to a web-accessible temporary directory using the original URL's filename and extension (including .php). By providing an invalid resolution parameter, an attacker triggers an early die() via forbiddenPage() before the temp file can be moved or cleaned up, leaving an executable PHP file persistently accessible under the web root at videos/cache/tmpFile/. Details The vulnerability is a race-free file upload leading to RCE, exploiting a logic flaw in the error handling order of operations. Step 1 — File download preserves dangerous extension: In objects/aVideoEncoder.json.php, when a downloadURL parameter is provided, the file is downloaded and saved with the URL's original basename: The format parameter (validated against $global['allowedExtension'] at line 42) is only used later for the final destination filename (line 238), not for the temp file. The temp file uses…

Published by the source

25 Mar 2026, 21:28 UTC

Last modified by the source

25 Mar 2026, 21:28 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-8wf4-c4x3-h952

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# Patch Next advisory brief: CVE-2026-33717

Advisory: AVideo: Remote Code Execution via PHP Temp File in Encoder downloadURL
IDs: CVE-2026-33717, GHSA-8wf4-c4x3-h952
Record: https://patchnext.com/advisories/cve-2026-33717 (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 8.8)
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 <= 26.0

## 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-8wf4-c4x3-h952 (GitHub-reviewed advisory GHSA-8wf4-c4x3-h952 lists affected ranges: Packagist wwbn/avideo >=0 <=26.0)

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