CVE-2026-3742 in YiFang
Summary
by MITRE • 03/08/2026
A vulnerability was detected in YiFang CMS 2.0.5. The impacted element is the function update of the file app/db/admin/D_singlePage.php. Performing a manipulation of the argument Title results in cross site scripting. It is possible to initiate the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 03/12/2026
The vulnerability identified as CVE-2026-3742 represents a critical cross site scripting flaw within YiFang CMS version 2.0.5, specifically affecting the update function of the administrative single page component. This issue resides in the file app/db/admin/D_singlePage.php where the Title parameter handling fails to properly sanitize user input, creating an avenue for malicious actors to inject arbitrary javascript code into the application's administrative interface. The vulnerability's remote exploitability means that attackers can initiate the attack without requiring physical access or local privileges, making it particularly dangerous for web applications that handle sensitive administrative data.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the CMS's administrative module. When administrators interact with the update function, the Title parameter is processed without proper sanitization measures, allowing malicious payloads to be stored and subsequently executed when the page content is rendered. This flaw directly maps to CWE-79, which describes cross site scripting vulnerabilities that occur when applications fail to properly validate or encode user-supplied data before incorporating it into dynamic web content. The vulnerability's classification aligns with ATT&CK technique T1566.001, which covers the exploitation of web applications through input validation flaws.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with potential access to the administrative interface of the CMS. Successful exploitation could enable attackers to modify content, inject malicious scripts that persist across user sessions, or even escalate privileges within the application environment. The fact that this exploit is publicly available and has been actively used increases the risk profile significantly, as it removes the need for sophisticated attack development and allows any attacker with basic knowledge to leverage this vulnerability. The lack of vendor response to early disclosure attempts further compounds the risk, leaving users without official patches or mitigation guidance during the critical window when the vulnerability is actively exploited in the wild.
Organizations utilizing YiFang CMS 2.0.5 should immediately implement defensive measures including input validation at multiple layers, output encoding for all user-supplied content, and regular monitoring of administrative interfaces for suspicious activity. The recommended mitigations align with defensive techniques outlined in the OWASP Top Ten 2021, particularly focusing on input validation and output encoding as primary defenses against XSS attacks. Network segmentation and web application firewalls can provide additional protective layers, while regular security audits should be conducted to identify similar vulnerabilities in other components of the CMS. The absence of vendor response underscores the importance of proactive security measures and the need for organizations to maintain independent vulnerability assessment capabilities rather than relying solely on vendor-provided security updates.