AVideo Affected by CSRF on Plugin Import Endpoint Enables Unauthenticated Remote Code Execution via Malicious Plugin Upload

Exploitation

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

CVSS

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

EPSS

• CVE-2026-33507: 0.37% estimated exploitation activity in the next 30 days; percentile 31.34 (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 objects/pluginImport.json.php endpoint allows admin users to upload and install plugin ZIP files containing executable PHP code, but lacks any CSRF protection. Combined with the application explicitly setting session.cookiesamesite = 'None' for HTTPS connections, an unauthenticated attacker can craft a page that, when visited by an authenticated admin, silently uploads a malicious plugin containing a PHP webshell, achieving Remote Code Execution on the server. Details The root cause has two components working together: 1. SameSite=None on session cookies (objects/includeconfig.php:134-137): This explicitly allows browsers to include the session cookie on cross-origin requests to the AVideo instance. 2. No CSRF protection on pluginImport.json.php (objects/pluginImport.json.php:18): The endpoint only checks User::isAdmin() via the session. There is: - No CSRF token validation (the verifyToken/globalToken mechanism used elsewhere is absent) - No allowOrigin() call (contrast…

Published by the source

20 Mar 2026, 21:47 UTC

Last modified by the source

25 Mar 2026, 20:31 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hv36-p4w4-6vmj

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# Patch Next advisory brief: CVE-2026-33507

Advisory: AVideo Affected by CSRF on Plugin Import Endpoint Enables Unauthenticated Remote Code Execution via Malicious Plugin Upload
IDs: CVE-2026-33507, GHSA-hv36-p4w4-6vmj
Record: https://patchnext.com/advisories/cve-2026-33507 (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-hv36-p4w4-6vmj (GitHub-reviewed advisory GHSA-hv36-p4w4-6vmj lists affected ranges: Packagist wwbn/avideo >=0 <=26.0)

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