CVE-2025-10353 is a critical vulnerability identified in the Melis Technology Melis Platform, specifically within the melis-cms-slider module. The root cause is a path equivalence flaw (CWE-43), which allows attackers to bypass file upload restrictions by manipulating the filename parameter ('mcsdetail_img') in a POST request to the '/melis/MelisCmsSlider/MelisCmsSliderDetails/saveDetailsForm' endpoint. This manipulation enables the upload of malicious files that the system improperly validates or sanitizes, leading to remote code execution (RCE). The vulnerability requires no authentication or user interaction, making it trivially exploitable over the network. The CVSS 4.0 score of 9.3 reflects the high impact on confidentiality, integrity, and availability, as attackers can execute arbitrary code, potentially taking full control of the affected system. Although no public exploits have been reported yet, the vulnerability's nature and ease of exploitation make it a critical risk. The affected version is listed as '0', which likely indicates early or initial versions of the Melis Platform. The lack of available patches at the time of publication increases the urgency for organizations to implement mitigations. The vulnerability was assigned and published by INCIBE, a reputable cybersecurity entity, underscoring its credibility and severity.

For European organizations, this vulnerability poses a significant threat, especially those utilizing the Melis Platform for content management or web services. Successful exploitation can lead to full system compromise, data breaches, service disruption, and potential lateral movement within networks. Critical sectors such as government, finance, healthcare, and infrastructure that rely on Melis Platform could face operational downtime and loss of sensitive information. The lack of authentication and user interaction requirements increases the risk of automated attacks and wormable exploits. Additionally, the high severity score indicates a broad impact on confidentiality, integrity, and availability, which could result in regulatory non-compliance and reputational damage under GDPR and other European data protection laws. Organizations without timely mitigation may become targets for cybercriminals seeking to leverage this vulnerability for espionage, ransomware deployment, or sabotage.

Given the absence of an official patch at the time of disclosure, European organizations should immediately implement compensating controls. These include restricting access to the vulnerable endpoint '/melis/MelisCmsSlider/MelisCmsSliderDetails/saveDetailsForm' via network segmentation and firewall rules, allowing only trusted IP addresses. Deploy web application firewalls (WAFs) with custom rules to detect and block suspicious file upload attempts, particularly those with path traversal patterns or unusual filename encodings. Conduct thorough input validation and sanitization on the server side to reject malformed or unexpected file names. Monitor logs for unusual POST requests to the affected endpoint and establish alerting for potential exploitation attempts. Organizations should also consider disabling or isolating the melis-cms-slider module if not essential. Finally, maintain close communication with Melis Technology for updates on official patches and apply them promptly once available.