Umbraco Forms version 4.0.0 up to and including 8.7.5 and below are vulnerable to a security flaw that could lead to a remote code execution attack and/or arbitrary file deletion. A vulnerability occurs because validation of the file extension is performed after the file has been stored in a temporary directory. By default, files are stored within the application directory structure at %BASEDIR%/APP_DATA/TEMP/FileUploads/. Whilst access to this directory is restricted by the root web.config file, it is possible to override this restriction by uploading another specially crafted web.config file to the temporary directory. It is possible to exploit this flaw to upload a malicious script file to execute arbitrary code and system commands on the server.
| Software | From | Fixed in |
|---|---|---|
| umbraco / forms | 8.7.0 | 8.7.6 |
| umbraco / forms | 8.6.0 | 8.6.2 |
| umbraco / forms | 8.5.0 | 8.5.7 |
| umbraco / forms | 8.4.0 | 8.4.4 |
| umbraco / forms | 8.3.0 | 8.3.4 |
| umbraco / forms | 8.2.0 | 8.2.3 |
| umbraco / forms | 8.1.0 | 8.1.6 |
| umbraco / forms | 8.0.0 | 8.0.2 |
| umbraco / forms | 7.5.0 | 7.5.4 |
| umbraco / forms | 7.4.0 | 7.4.3 |
| umbraco / forms | 7.2.0 | 7.2.1 |
| umbraco / forms | 7.1.0 | 7.1.4 |
| umbraco / forms | 7.0.0 | 7.0.7 |
| umbraco / forms | 4.0.0 | 4.4.9 |
| umbraco / forms | 6.0.0 | 6.0.10 |
| umbraco / forms | 7.3.0 | 7.3.2 |
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.