WordPress is an open publishing platform for the Web. It's possible for a file of a type other than a zip file to be submitted as a new plugin by an administrative user on the Plugins -> Add New -> Upload Plugin screen in WordPress. If FTP credentials are requested for installation (in order to move the file into place outside of the uploads directory) then the uploaded file remains temporary available in the Media Library despite it not being allowed. If the DISALLOW_FILE_EDIT constant is set to true on the site and FTP credentials are required when uploading a new theme or plugin, then this technically allows an RCE when the user would otherwise have no means of executing arbitrary PHP code. This issue only affects Administrator level users on single site installations, and Super Admin level users on Multisite installations where it's otherwise expected that the user does not have permission to upload or execute arbitrary PHP code. Lower level users are not affected. Sites where the DISALLOW_FILE_MODS constant is set to true are not affected. Sites where an administrative user either does not need to enter FTP credentials or they have access to the valid FTP credentials, are not affected. The issue was fixed in WordPress 6.4.3 on January 30, 2024 and backported to versions 6.3.3, 6.2.4, 6.1.5, 6.0.7, 5.9.9, 5.8.9, 5.7.11, 5.6.13, 5.5.14, 5.4.15, 5.3.17, 5.2.20, 5.1.18, 5.0.21, 4.9.25, 2.8.24, 4.7.28, 4.6.28, 4.5.31, 4.4.32, 4.3.33, 4.2.37, and 4.1.40. A workaround is available. If the DISALLOW_FILE_MODS constant is defined as true then it will not be possible for any user to upload a plugin and therefore this issue will not be exploitable.
| Software | From | Fixed in |
|---|---|---|
| WordPress / wordpress | - | 4.1.40 |
| WordPress / wordpress | 4.2 | 4.2.37 |
| WordPress / wordpress | 4.3 | 4.3.33 |
| WordPress / wordpress | 4.4 | 4.4.32 |
| WordPress / wordpress | 4.5 | 4.5.31 |
| WordPress / wordpress | 4.6 | 4.6.28 |
| WordPress / wordpress | 4.7 | 4.7.28 |
| WordPress / wordpress | 4.8 | 4.8.24 |
| WordPress / wordpress | 4.9 | 4.9.25 |
| WordPress / wordpress | 5.0 | 5.0.21 |
| WordPress / wordpress | 5.1 | 5.1.18 |
| WordPress / wordpress | 5.2 | 5.2.20 |
| WordPress / wordpress | 5.3 | 5.3.17 |
| WordPress / wordpress | 5.4 | 5.4.15 |
| WordPress / wordpress | 5.5 | 5.5.14 |
| WordPress / wordpress | 5.6 | 5.6.13 |
| WordPress / wordpress | 5.7 | 5.7.11 |
| WordPress / wordpress | 5.8 | 5.8.9 |
| WordPress / wordpress | 5.9 | 5.9.9 |
| WordPress / wordpress | 6.0 | 6.0.7 |
| WordPress / wordpress | 6.1 | 6.1.5 |
| WordPress / wordpress | 6.2 | 6.2.4 |
| WordPress / wordpress | 6.3 | 6.3.3 |
| WordPress / wordpress | 6.4.0 | 6.4.3 |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.