CVE-2026-48909 in SP LMS Extension
Summary
by MITRE • 06/21/2026
SP LMS (com_splms) < 4.1.4 by JoomShaper deserializes user-controlled cookie data without validation, enabling an unauthenticated remote attacker to execute arbitrary code on the server.
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Analysis
by VulDB Data Team • 06/21/2026
The vulnerability exists within the SP LMS component version 4.1.4 and earlier developed by JoomShaper, which processes user-controlled cookie data during deserialization without proper input validation. This flaw falls under the category of insecure deserialization as defined by CWE-502, where untrusted data is directly deserialized into objects without adequate security checks. The component fails to validate or sanitize cookie values before processing them, creating an opportunity for malicious actors to manipulate the deserialization process. Attackers can exploit this weakness by crafting specially crafted cookie data that, when processed by the vulnerable application, triggers arbitrary code execution on the target server. The vulnerability is particularly dangerous because it allows unauthenticated remote code execution, meaning that attackers do not need valid credentials to exploit the flaw. This type of vulnerability aligns with ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain remote access and execute malicious code. The impact of such a vulnerability extends beyond simple data theft, as it can enable full system compromise and persistent access to the affected server infrastructure.
The technical exploitation of this vulnerability occurs through the manipulation of cookie values that are subsequently deserialized by the SP LMS component. When the application processes these cookies, it deserializes the data without proper sanitization or validation, allowing attackers to inject malicious serialized objects. The deserialization process typically involves converting serialized data back into objects that can be executed by the application's runtime environment. In this case, the lack of input validation creates a pathway for attackers to inject malicious payloads that can be executed with the privileges of the web application. The vulnerability is particularly concerning in the context of web applications that rely heavily on session management and cookie-based authentication, as it bypasses traditional authentication mechanisms entirely. The absence of proper security controls during the deserialization phase allows attackers to escalate their privileges and potentially gain complete control over the server. This type of vulnerability is often classified under the OWASP Top Ten as part of the insecure deserialization category, which represents a critical security risk for web applications.
The operational impact of this vulnerability is severe and multifaceted, affecting both the confidentiality and integrity of the affected systems. An attacker who successfully exploits this vulnerability can execute arbitrary code on the server, potentially leading to complete system compromise, data exfiltration, and persistent backdoor installation. The unauthenticated nature of the exploit means that attackers can target vulnerable systems without requiring prior access or credentials, making it particularly attractive for automated attacks. Organizations using affected versions of SP LMS are at risk of experiencing unauthorized access to sensitive data, disruption of services, and potential regulatory compliance violations. The vulnerability also creates opportunities for attackers to establish persistence within the network, potentially leading to extended compromise periods. This type of vulnerability is often exploited in targeted attacks against web applications, particularly those that are publicly accessible and lack proper input validation mechanisms. The attack surface is broadened by the fact that cookie data is commonly used for session management, making the exploitation of such vulnerabilities particularly effective in real-world scenarios.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected component to version 4.1.4 or later, which addresses the insecure deserialization issue. Organizations should implement proper input validation and sanitization mechanisms for all cookie data processed by the application, ensuring that no untrusted data is directly deserialized without proper security checks. The implementation of secure deserialization practices, including the use of allowlists for valid classes and proper object validation, can significantly reduce the risk of exploitation. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to monitor for suspicious cookie manipulation attempts. Network segmentation and privilege separation can help limit the potential impact if an attacker does manage to exploit the vulnerability. Security monitoring should include regular vulnerability scanning and penetration testing to identify similar issues within the application stack. The remediation process should also involve reviewing all other components and modules for similar deserialization vulnerabilities, as this type of flaw often indicates broader security issues within the application architecture. Organizations should also establish proper security awareness training for developers to prevent similar issues in future development cycles, ensuring that secure coding practices are followed throughout the software development lifecycle.