CVE-2026-28085: High Vulnerability in ThemeREX Mahogany

CVE-2026-28085 is a high-severity vulnerability classified as a 'PHP Remote File Inclusion' issue affecting the ThemeREX Mahogany theme. This vulnerability allows improper control of the filename for include/require statements in PHP programs, leading to PHP Local File Inclusion. The affected versions range from n/a through version 2.9. Organizations using this theme must be aware of the potential security implications due to this flaw.

The CVSS score for this vulnerability is 8.1, indicating a high severity level. The attack vector is network-based, and the complexity is rated as high, meaning that exploitation may require specific conditions to be met. The absence of required privileges and user interaction makes it more concerning, as attackers can potentially exploit the vulnerability without requiring access rights or user actions.

Risk to organizations includes significant impacts on confidentiality, integrity, and availability, as all are rated high. Given the nature of this vulnerability, organizations should prioritize patching immediately to prevent unauthorized access and potential data breaches.

As of the latest updates, there are no known public exploits or proof-of-concept code available for CVE-2026-28085, and it has not been classified as actively exploited. However, the high-risk nature of this vulnerability necessitates prompt action from security teams to ensure their systems are protected.

Vulnerability Details

The vulnerability arises from an improper control of filenames in the ThemeREX Mahogany theme, which can allow attackers to include arbitrary files. This weakness is categorized under CWE-98, which pertains to improper control of filename for include/require statements. The theme is affected from unspecified versions up to and including 2.9. The vulnerability was published on March 5, 2026.

The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, highlighting a network attack vector with high complexity. There are no specific vendor patches or remediation details available at this time.

Technical Analysis

The root cause of CVE-2026-28085 is an inadequate validation of filename input for PHP include/require statements in the ThemeREX Mahogany theme. This flaw allows attackers to leverage crafted requests to include arbitrary files from the server, leading to Local File Inclusion (LFI). The attack vector is network-based, and the complexity is rated as high, indicating that exploitation may require specific conditions, such as knowledge of the underlying file structure.

The attack does not require any privileges, nor does it necessitate user interaction, making it a significant concern for organizations using the affected theme. The impacts on confidentiality, integrity, and availability are all rated high, meaning that successful exploitation could lead to unauthorized data access, modification, or denial of service.

Risk & Impact Analysis

Organizations using the ThemeREX Mahogany theme face significant risks due to CVE-2026-28085. The potential for unauthorized file access can lead to data breaches, compromising sensitive information. The high severity rating emphasizes the urgency for organizations to implement a patch or mitigation strategy as soon as possible.

The vulnerability's exploitation could have a wide blast radius, impacting not only the immediate systems but also potentially allowing lateral movement within the network. This could lead to a broad range of security incidents, including data theft and system compromise. Given the high CVSS score of 8.1 and its classification as high-risk, organizations should address this vulnerability in their priority patch cycle.

Exploitation Status

Affected Versions

The vulnerability affects ThemeREX Mahogany versions from n/a through version 2.9. Organizations should ensure they are running the latest patched version to mitigate the risk associated with this vulnerability.

Mitigation & Remediation

Organizations should prioritize patching their ThemeREX Mahogany installations immediately. Given the high severity of this vulnerability, it is crucial to apply any available updates from the vendor. If a patch is not available, consider disabling the affected theme until a fix is implemented.

For ongoing security, organizations may benefit from implementing penetration testing to identify similar weaknesses in their applications.

Detection Guidance

To detect potential exploitation of this vulnerability, security teams should monitor for unusual log entries related to PHP file includes. Additionally, behavioral anomalies in web application interactions may indicate attempts to leverage this flaw. Regular review of access logs can help identify unauthorized access attempts.

AppSecure Threat Intelligence Insight

The emergence of CVE-2026-28085 highlights the ongoing challenges organizations face in securing PHP-based applications. It underscores the necessity for robust validation mechanisms for file inclusions in web applications. Security teams should take this opportunity to reassess their application security strategies and implement comprehensive testing measures.

This vulnerability also reflects a broader trend in web application security where inadequate input validation can lead to severe consequences. By adopting a proactive approach to security, organizations can better protect themselves against similar vulnerabilities. For further guidance on building effective security measures, consider reviewing our penetration testing methodology and enhancing their application security assessments.

Organizations should also stay informed about emerging threats and vulnerabilities through continuous education and engagement with security resources. Our vulnerability management program can assist in structuring their defense mechanisms effectively.