CVE-2024-35239 in Umbraco.Forms.Issues
Summary
by MITRE • 05/29/2024
Umbraco Commerce is an open source dotnet web forms solution. In affected versions an authenticated user that has access to edit Forms may inject unsafe code into Forms components. This issue can be mitigated by configuring TitleAndDescription:AllowUnsafeHtmlRendering after upgrading to one of the patched versions (13.0.1, 12.2.2, 10.5.3, 8.13.13).
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Analysis
by VulDB Data Team • 01/05/2026
The vulnerability identified as CVE-2024-35239 affects Umbraco Commerce, a popular open source dotnet web forms solution designed for e-commerce implementations. This security flaw represents a significant risk to organizations relying on the platform for their online commerce operations. The vulnerability specifically targets the form editing functionality within the Umbraco Commerce ecosystem, creating a potential pathway for code injection attacks that could compromise the integrity and security of web applications built using this framework.
The technical flaw stems from insufficient input validation and output sanitization within the Forms component editing functionality. An authenticated user with appropriate permissions to modify forms can inject unsafe code into form components, potentially leading to arbitrary code execution or cross-site scripting attacks. This vulnerability operates at the application layer and exploits the trust relationship between the authenticated user and the system, leveraging the legitimate access rights to perform malicious activities. The issue is particularly concerning because it allows privilege escalation through existing user accounts rather than requiring external exploitation.
The operational impact of this vulnerability extends beyond simple code injection, potentially enabling attackers to execute malicious scripts within the context of the web application. This could result in unauthorized data access, session hijacking, or even complete system compromise if the application has elevated privileges. The vulnerability affects multiple versions of Umbraco Commerce, with specific patched versions available including 13.0.1, 12.2.2, 10.5.3, and 8.13.13, indicating the severity of the issue across different release branches. Organizations utilizing Umbraco Commerce must urgently assess their current deployment status and implement the necessary upgrades to mitigate this risk.
The recommended mitigation strategy involves configuring the TitleAndDescription:AllowUnsafeHtmlRendering parameter after upgrading to the patched versions, which provides administrators with granular control over HTML rendering behavior. This approach aligns with security best practices for input validation and output encoding, addressing the root cause of the vulnerability while maintaining system functionality. The mitigation process should be implemented as part of a comprehensive security update procedure, including thorough testing of form components to ensure that the configuration changes do not negatively impact legitimate business operations.
This vulnerability maps to CWE-79 which describes Cross-Site Scripting (XSS) flaws, specifically highlighting the dangerous combination of user-controllable input and unsafe HTML rendering. The ATT&CK framework categorizes this as a privilege escalation technique through valid accounts, where the attacker leverages existing access rights to execute malicious code. Organizations should consider implementing additional security controls such as web application firewalls, regular security assessments, and monitoring for suspicious form modifications to provide defense in depth against similar vulnerabilities. The vulnerability also demonstrates the importance of proper input validation in web applications and the need for secure coding practices that prevent user input from being directly rendered without appropriate sanitization.