CVE-2024-55086 is a Server-Side Request Forgery (SSRF) vulnerability identified in the GetSimple CMS CE version 3.3.19, specifically within the backend management system's plug-in download address functionality. SSRF vulnerabilities allow an attacker to induce the server to make HTTP requests to arbitrary domains, including internal network resources that are otherwise inaccessible externally. In this case, the vulnerability requires authenticated access with high privileges (likely administrator or management roles) but does not require user interaction beyond that. The attacker can manipulate the URL or address used for downloading plug-ins, causing the server to send requests to unintended destinations. This can lead to unauthorized internal network scanning, access to sensitive internal services, or even exploitation of other vulnerabilities in internal systems. The CVSS 3.1 score of 7.2 reflects high severity due to the network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Although no public exploit code or active exploitation has been reported, the vulnerability poses a significant risk to organizations using this CMS version, especially those with sensitive internal networks behind the CMS server. The CWE-918 classification confirms the SSRF nature of the flaw. No official patches or fixes have been linked yet, emphasizing the need for cautious mitigation.

The impact of CVE-2024-55086 is substantial for organizations using GetSimple CMS CE 3.3.19. Successful exploitation can compromise the confidentiality of internal network resources by allowing attackers to access sensitive data not normally reachable from outside. Integrity can be affected if attackers leverage SSRF to interact with internal services that control or modify data. Availability may also be impacted if attackers use SSRF to trigger denial-of-service conditions on internal systems. Since the vulnerability requires high privileges, the initial compromise vector is limited to authenticated backend users, but insider threats or compromised credentials can enable exploitation. The SSRF can be a pivot point for further attacks, including lateral movement within internal networks or exploitation of other internal vulnerabilities. Organizations relying on GetSimple CMS for website management or internal portals may face data breaches, service disruptions, or reputational damage if this vulnerability is exploited.

To mitigate CVE-2024-55086, organizations should first verify if they are running GetSimple CMS CE version 3.3.19 or any version affected by this SSRF vulnerability. Since no official patch is currently available, immediate mitigation steps include restricting backend management access to trusted administrators only and enforcing strict network segmentation to limit the server's ability to reach sensitive internal resources. Implementing firewall rules to block outbound requests from the CMS server to internal IP ranges can reduce SSRF exploitation risk. Monitoring and logging all outbound HTTP requests from the CMS server can help detect suspicious activity. Additionally, applying the principle of least privilege to backend users reduces the risk of exploitation by compromised accounts. Organizations should stay alert for official patches or updates from GetSimple CMS and apply them promptly once released. Conducting regular security assessments and penetration testing focusing on SSRF and related vulnerabilities is also recommended.