CVE-2026-3743 in YiFang
Summary
by MITRE • 03/08/2026
A flaw has been found in YiFang CMS 2.0.5. This affects the function update of the file app/db/admin/D_singlePageGroup.php. Executing a manipulation of the argument Name can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been published 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-2026-3743 represents a critical cross site scripting flaw within YiFang CMS version 2.0.5, specifically affecting the update function within the file app/db/admin/D_singlePageGroup.php. This issue stems from inadequate input validation and sanitization mechanisms that fail to properly process user-supplied data. The vulnerability manifests when the Name parameter is manipulated during the update operation, allowing malicious actors to inject malicious scripts that execute in the context of other users' browsers. The flaw's remote exploitation capability means that attackers can launch assaults without requiring physical access to the system or local network presence, making it particularly dangerous for web applications that are publicly accessible.
The technical implementation of this vulnerability aligns with CWE-79, which categorizes cross site scripting flaws as weaknesses in input validation and output encoding. The specific function update in D_singlePageGroup.php appears to directly incorporate user-provided Name arguments into dynamic content generation without appropriate sanitization or context-appropriate encoding. This creates an environment where malicious payloads can be executed when legitimate users view the affected pages, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The vulnerability's classification as a remote code execution risk stems from the fact that attackers can craft malicious Name parameters that, when processed by the vulnerable function, result in script injection within the browser context of other users.
The operational impact of CVE-2026-3743 extends beyond simple script injection, potentially enabling attackers to establish persistent access to affected systems through session manipulation and credential harvesting. This vulnerability can be exploited through various attack vectors including phishing campaigns, compromised user accounts, or direct web-based exploitation. The fact that an exploit has been published and is available for use significantly increases the risk profile, as it removes the requirement for advanced technical skills to leverage the vulnerability. Organizations running YiFang CMS 2.0.5 are particularly at risk since the flaw exists within core administrative functionality, potentially allowing attackers to gain unauthorized access to sensitive system controls and data.
Security practitioners should implement immediate mitigations including input validation and output encoding measures to prevent the exploitation of this vulnerability. The recommended approach involves sanitizing all user inputs through proper validation routines and implementing context-appropriate encoding for dynamic content generation. Additionally, network-based mitigations such as web application firewalls and intrusion detection systems can help detect and block exploitation attempts. Organizations should also consider implementing the principle of least privilege for administrative accounts and ensure comprehensive monitoring of system activities. The vulnerability's exposure through the ATT&CK framework maps to techniques involving command and control communications and credential access, making it particularly dangerous for organizations that do not maintain robust security monitoring practices. The lack of vendor response to early disclosure efforts further compounds the risk, as organizations may not receive timely patches or official guidance for addressing the vulnerability.