A weakness has been identified in EyouCMS up to version 1.7.1/5.0. The affected function is check_userinfo in the file Diyajax.php of the Member Avatar Handler component. Executing a manipulation of the argument viewfile can lead to unrestricted file uploads, which may be exploited remotely. The vulnerability has been publicly disclosed, and the vendor was contacted prior to this disclosure but did not respond.
This vulnerability has been assigned a CVSS score of 2.1, categorizing it as low severity. Despite the low score, the potential for unauthorized file uploads can pose risks to organizations utilizing EyouCMS, especially if sensitive data is exposed or compromised. Given the public availability of the exploit, organizations should address this vulnerability promptly.
Organizations using EyouCMS should prioritize remediation efforts to mitigate any risks stemming from this vulnerability. Addressing the issue is crucial to maintaining the security and integrity of systems utilizing this content management system.
It is essential for organizations to remain vigilant regarding vulnerabilities and ensure timely updates and patches are applied to their systems.
Vulnerability Details
The vulnerability, CVE-2026-1107, affects EyouCMS versions up to 1.7.1 and 5.0. The primary weakness resides in the check_userinfo function within the Diyajax.php file, which handles member avatars. By manipulating the viewfile argument, an attacker can execute unrestricted file uploads.
The CVSS score of 2.1 indicates low severity, with a low attack complexity. The vulnerability can be exploited without user interaction and requires low privileges. The potential impacts on confidentiality, integrity, and availability are all rated as low, but the possibility of file uploads remains a concern.
Published on January 18, 2026, this vulnerability falls under the CWE classifications of CWE-284 (Improper Access Control) and CWE-434 (Unrestricted File Upload).
Technical Analysis
The root cause of this vulnerability lies in the insufficient validation of the viewfile argument within the check_userinfo function. By exploiting this flaw, an attacker can upload files that may lead to code execution or further compromise of the application.
The attack vector is network-based, allowing remote exploitation. The attack complexity is classified as low, requiring minimal effort from the attacker. No user interaction is required, and only low privileges are necessary to execute the exploit.
The impacts on confidentiality, integrity, and availability are rated as low, indicating that while the vulnerability presents risks, the potential damage is limited compared to higher-severity vulnerabilities.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized file uploads, which can lead to further exploitation of the system. The presence of this vulnerability could enable attackers to gain access to sensitive data or execute malicious code on affected installations of EyouCMS.
With the public availability of the exploit and the lack of response from the vendor, organizations utilizing EyouCMS should assess their exposure to this vulnerability. The urgency for remediation should be aligned with existing security policies and vulnerability management practices.
Given the relatively low CVSS score, organizations may choose to schedule remediation in their routine maintenance cycle. However, the potential risks associated with unrestricted file uploads warrant consideration for more immediate action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of EyouCMS are as follows: 1.7.0, 1.7.1, and 5.0. Organizations should ensure they are running patched versions to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching to remediate the identified vulnerability in EyouCMS. It is critical to upgrade to the latest version where this issue has been addressed. For those unable to apply an update immediately, consider implementing workarounds to restrict file uploads.
Further, organizations may enhance security through configuration hardening, ensuring that file upload mechanisms are tightly controlled. Additionally, network controls can be established to limit access to the affected components.
Continuous monitoring for any unauthorized file uploads or other anomalies is also recommended. Organizations may validate their remediation through penetration testing to identify similar weaknesses.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual file uploads. Behavioral anomalies may indicate attempts to manipulate the viewfile argument.
Network signatures may also be established to identify traffic indicative of exploitation attempts. Additionally, any unauthorized changes to the system or application should be closely reviewed.
AppSecure Threat Intelligence Insight
The identification of CVE-2026-1107 highlights the ongoing challenges faced by web applications in managing file uploads securely. This vulnerability illustrates a trend where insufficient access controls lead to potential exploitation.
Organizations should learn from this incident to bolster their defenses against similar vulnerabilities. It is crucial for security teams to implement comprehensive security testing and maintain awareness of emerging threats.
For further insights into enhancing security posture, organizations can refer to resources on vulnerability management and best practices in penetration testing implementation.
Organizations are also encouraged to review their security frameworks and incorporate continuous security assessments as part of their overall security strategy.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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