AVideo: Unauthenticated File Deletion via PHP Operator Precedence Bug in CLI Guard

Exploitation

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

CVSS

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

EPSS

• CVE-2026-34733: 0.35% estimated exploitation activity in the next 30 days; percentile 28.31 (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 AVideo installation script install/deleteSystemdPrivate.php contains a PHP operator precedence bug in its CLI-only access guard. The script is intended to run exclusively from the command line, but the guard condition !phpsapiname() === 'cli' never evaluates to true due to how PHP resolves operator precedence. The ! (logical NOT) operator binds more tightly than === (strict comparison), causing the expression to always evaluate to false, which means the die() statement never executes. As a result, the script is accessible via HTTP without authentication and will delete files from the server's temp directory while also disclosing the temp directory contents in its response. Details The faulty guard is at lines 2-4 of the script: Due to PHP operator precedence, this expression is parsed as: Step-by-step evaluation when accessed via HTTP (Apache/nginx with modphp or php-fpm): 1. phpsapiname() returns "apache2handler" (or "fpm-fcgi", etc.) - a non-empty string 2.…

Published by the source

1 Apr 2026, 21:06 UTC

Last modified by the source

1 Apr 2026, 21:06 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-wwpw-hrx8-79r5

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# Patch Next advisory brief: CVE-2026-34733

Advisory: AVideo: Unauthenticated File Deletion via PHP Operator Precedence Bug in CLI Guard
IDs: CVE-2026-34733, GHSA-wwpw-hrx8-79r5
Record: https://patchnext.com/advisories/cve-2026-34733 (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: Medium (CVSS 6.5)
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-wwpw-hrx8-79r5 (GitHub-reviewed advisory GHSA-wwpw-hrx8-79r5 lists affected ranges: Packagist wwbn/avideo >=0 <=26.0)

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