CVE-2026-28017 is a high-severity vulnerability classified as a local file inclusion (LFI) in the ThemeREX Green Thumb plugin for WordPress. This vulnerability allows for improper control of filenames for include/require statements in PHP programs. Specifically, it affects versions of Green Thumb up to and including 1.1.12, potentially putting organizations at significant risk.
The CVSS score of 8.1 indicates a high severity level, making it critical for organizations to address this vulnerability promptly. The risk to organizations includes potential unauthorized access to files on the server, leading to data exposure or manipulation.
Currently, the vulnerability is marked as deferred. However, it is vital for organizations to remain vigilant and consider the implications of this vulnerability, as exploitation can lead to severe consequences.
Organizations should prioritize patching immediately, particularly those running affected versions of the Green Thumb theme.
Vulnerability Details
The vulnerability description states that this issue allows PHP local file inclusion due to improper control of filenames in include/require statements. Officially classified under CWE-98, the vulnerability can be exploited over the network, requiring no privileges or user interaction.
The attack complexity is rated as high, indicating that successful exploitation may require specific conditions or settings to be in place. The impacts on confidentiality, integrity, and availability are all classified as high, emphasizing the severity of this vulnerability.
This vulnerability was published on March 5, 2026, and organizations are advised to monitor their systems for any signs of compromise.
Technical Analysis
The root cause of CVE-2026-28017 stems from the improper handling of filenames in PHP include/require statements. Attackers may leverage this issue by manipulating input to include unintended PHP files, leading to the execution of malicious code.
The attack vector is network-based, meaning an attacker does not need direct access to the server to exploit this vulnerability. The complexity of the attack remains high, as the attacker must navigate through potential security mechanisms in place.
No privileges are required for exploitation, and no user interaction is necessary, making this vulnerability particularly dangerous. The potential impacts on confidentiality include unauthorized access to sensitive files, while integrity and availability could also be compromised, affecting overall system operation.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to sensitive information, which could lead to data breaches or manipulation of critical files. The blast radius potential is significant, especially for organizations that rely heavily on the ThemeREX Green Thumb plugin for their website functionality.
Urgency is high for remediation, given the potential for exploitation. Organizations should implement patches as soon as they become available and consider additional security measures to mitigate the risk while a fix is awaited.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of ThemeREX Green Thumb prior to the patch are affected, specifically versions from n/a through 1.1.12.
Mitigation & Remediation
Organizations should immediately apply any available patches to the Green Thumb theme. If a patch is not available, consider implementing additional security controls such as web application firewalls (WAF) to filter out malicious requests.
Configuration hardening is also recommended, including limiting file inclusion permissions and ensuring that error messages do not reveal sensitive information.
For more information on penetration testing services, organizations can refer to penetration testing that can help identify vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unusual file inclusion attempts or access to sensitive files. Behavioral anomalies, such as unexpected file access patterns, should also be investigated.
Network signatures that indicate attempts to exploit this vulnerability should be established, and any unauthorized changes to the system should be logged and reviewed.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-28017 highlights the need for ongoing vigilance in web application security, especially for plugins that handle file inclusions. This vulnerability represents a common failure point in many web applications and underscores the importance of secure coding practices.
Security teams should be aware of trends in local file inclusion vulnerabilities and consider implementing comprehensive security assessments to identify and mitigate similar weaknesses.
For further insights into vulnerability management, organizations can explore our vulnerability management program that helps navigate these challenges effectively.
Additionally, our guide on penetration testing methodology offers practical steps to strengthen security posture against such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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