What is the CVSS score of CVE-2026-33717?

CVE-2026-33717 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of PHP are affected by CVE-2026-33717?

WWBN AVideo installations up to version 26.0 are vulnerable to remote code execution through authenticated file upload manipulation, allowing attackers with valid credentials to execute arbitrary…

How to fix or mitigate CVE-2026-33717?

Within 24 hours: Identify all WWBN AVideo deployments and document current versions; disable remote file download functionality if operationally feasible. Within 7 days: Implement network-level restrictions limiting file upload endpoints to trusted sources only; conduct access review of authenticated user accounts. Within 30 days: Migrate to patched version when available; conduct forensic review of upload directories and web logs for indicators of exploitation.

PHP CVE-2026-33717

EUVD-2026-14504 HIGH

Unrestricted Upload of File with Dangerous Type (CWE-434)

2026-03-23 GitHub_M

GHSA-8wf4-c4x3-h952

PHP File Upload

8.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 23, 2026 - 19:00 euvd

EUVD-2026-14504

Analysis Generated

Mar 23, 2026 - 19:00 vuln.today

CVE Published

Mar 23, 2026 - 18:48 nvd

HIGH 8.8

DescriptionGitHub Advisory

WWBN AVideo is an open source video platform. In versions up to and including 26.0, 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/. Commit 6da79b43484099a0b660d1544a63c07b633ed3a2 contains a patch.

AnalysisAI

WWBN AVideo versions up to and including 26.0 contain a critical file upload vulnerability (CWE-434) that allows authenticated attackers to upload and execute arbitrary PHP code on the server. The vulnerability exists in the downloadVideoFromDownloadURL() function which saves remote content with its original filename and extension to a web-accessible directory; by providing an invalid resolution parameter, attackers can bypass cleanup mechanisms, leaving executable PHP files persistent under the web root. With a CVSS score of 8.8, this represents a high-severity remote code execution risk for authenticated users.

Technical ContextAI

The vulnerability affects WWBN AVideo (cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*), an open-source video platform built in PHP. The root cause is CWE-434 (Unrestricted Upload of File with Dangerous Type), specifically in the objects/aVideoEncoder.json.php file. The downloadVideoFromDownloadURL() function downloads remote content and saves it to the videos/cache/tmpFile/ directory using the original URL's filename without proper sanitization or type restriction. The function's error handling via forbiddenPage() combined with an early die() statement creates a race condition where malicious PHP files persist in a web-accessible location before the intended cleanup or relocation can occur. This represents a classic insecure file upload pattern where user-controlled filenames are trusted and placed directly under the web root without validation.

RemediationAI

Organizations running WWBN AVideo should immediately upgrade to a version containing commit 6da79b43484099a0b660d1544a63c07b633ed3a2 or later, which patches the file upload vulnerability in the downloadVideoFromDownloadURL() function (see patch details at https://github.com/WWBN/AVideo/commit/6da79b43484099a0b660d1544a63c07b633ed3a2). Consult the GitHub security advisory at https://github.com/WWBN/AVideo/security/advisories/GHSA-8wf4-c4x3-h952 for complete remediation guidance. As a temporary mitigation until patching is possible, restrict access to the AVideo platform to trusted users only, disable user registration if enabled, implement web application firewall rules to block requests with suspicious resolution parameters to aVideoEncoder.json.php, and monitor the videos/cache/tmpFile/ directory for unauthorized PHP files. Consider restricting execution permissions on the cache directory via web server configuration as an additional defense-in-depth measure.