CVE-2025-10353 is a critical vulnerability identified in the Melis Technology Melis Platform, specifically in the melis-cms-slider module. The root cause is a path equivalence issue (CWE-43), which allows an attacker to bypass normal file upload restrictions by manipulating the filename parameter ('mcsdetail_img') in a POST request to the endpoint '/melis/MelisCmsSlider/MelisCmsSliderDetails/saveDetailsForm'. This manipulation enables the upload of malicious files that can be executed remotely, leading to remote code execution (RCE) without requiring any authentication or user interaction. The vulnerability is severe, with a CVSS 4.0 score of 9.3, reflecting its network attack vector, low complexity, and high impact on confidentiality, integrity, and availability. The flaw allows attackers to gain full control over affected systems, potentially leading to data breaches, system compromise, and lateral movement within networks. Although no public exploits or patches are currently available, the vulnerability's presence in a CMS module that manages slider content suggests that many web-facing applications using Melis Platform could be exposed. The lack of authentication requirements and the direct file upload vector make this vulnerability particularly dangerous. The technical details confirm the vulnerability was reserved in September 2025 and published in October 2025, with INCIBE as the assigner. Organizations using Melis Platform should urgently assess their exposure and implement mitigations to prevent exploitation.

For European organizations, the impact of CVE-2025-10353 is substantial. Successful exploitation can lead to full system compromise, allowing attackers to execute arbitrary code, steal sensitive data, disrupt services, or use compromised systems as footholds for further attacks. This is especially critical for industries relying on web content management systems, such as media, e-commerce, government portals, and critical infrastructure. The vulnerability’s exploitation could result in data breaches violating GDPR regulations, leading to legal and financial penalties. Additionally, compromised systems could be used to launch attacks on other European networks or critical infrastructure, amplifying the threat. The absence of authentication and user interaction requirements means attackers can automate exploitation at scale, increasing the risk of widespread incidents. Organizations with public-facing Melis Platform deployments are at highest risk, particularly those without robust network segmentation or monitoring. The lack of available patches necessitates immediate interim controls to reduce exposure.

To mitigate CVE-2025-10353, European organizations should implement the following specific measures: 1) Immediately restrict file upload functionality by enforcing strict server-side validation of file types, sizes, and names to prevent malicious payloads. 2) Implement allowlists for acceptable file extensions and reject any files with suspicious or multiple extensions (e.g., filename....). 3) Employ web application firewalls (WAFs) with custom rules to detect and block suspicious POST requests targeting '/melis/MelisCmsSlider/MelisCmsSliderDetails/saveDetailsForm'. 4) Monitor logs for unusual upload activity or attempts to exploit the 'mcsdetail_img' parameter. 5) Isolate the Melis Platform environment using network segmentation to limit lateral movement if compromise occurs. 6) Disable or restrict the vulnerable module if feasible until a vendor patch is available. 7) Engage with Melis Technology for updates and patches, and apply them promptly once released. 8) Conduct penetration testing and vulnerability scanning focused on file upload mechanisms. 9) Educate development and security teams about path equivalence issues and secure file handling best practices. These targeted actions go beyond generic advice and address the specific exploitation vector of this vulnerability.