CVE-2025-65868 is a critical vulnerability classified as CWE-611 (Improper Restriction of XML External Entity Reference) affecting eyoucms version 1.7.1. The flaw arises from improper handling of XML input in the CMS, allowing an attacker to inject malicious XML external entities via the body of a POST request. This XXE injection can be exploited remotely without authentication or user interaction, enabling denial of service attacks by causing the XML parser to process crafted entities that consume excessive resources or cause application crashes. The vulnerability has a CVSS v3.1 base score of 9.1, reflecting its critical impact on confidentiality and availability, with an attack vector over the network and low attack complexity. Although no known exploits are currently active in the wild and no official patches have been released, the vulnerability poses a significant risk to systems running eyoucms 1.7.1. The lack of authentication requirements and the ability to trigger DoS remotely make this a high-priority issue. The vulnerability can also potentially expose sensitive data if the XML parser accesses local files or network resources via external entities, although the primary impact reported is denial of service. The absence of patch links indicates that users must rely on configuration changes or mitigations until an official fix is available.

For European organizations, this vulnerability can lead to significant service disruptions due to denial of service attacks, impacting availability of websites or applications running eyoucms 1.7.1. Organizations relying on this CMS for public-facing services or internal portals may experience downtime, affecting business continuity and user trust. Additionally, the potential for confidentiality breaches exists if external entities are leveraged to access sensitive files or data, posing compliance risks under GDPR and other data protection regulations. The ease of exploitation without authentication increases the threat landscape, making automated attacks feasible. Sectors such as government, finance, healthcare, and e-commerce in Europe that use eyoucms may face operational and reputational damage. The lack of patches heightens urgency for interim mitigations. The vulnerability could also be leveraged as part of multi-stage attacks, amplifying its impact.

1. Immediately disable XML external entity processing in the XML parsers used by eyoucms, if configurable, to prevent XXE injection. 2. Implement strict input validation and sanitization on all XML inputs, especially POST request bodies. 3. Employ web application firewalls (WAFs) with rules to detect and block malicious XML payloads indicative of XXE attacks. 4. Monitor network traffic for unusual POST requests containing XML data and anomalous spikes in resource usage that may indicate DoS attempts. 5. Isolate and limit the privileges of the eyoucms application to restrict access to sensitive files and network resources. 6. Regularly audit and update all third-party libraries and dependencies related to XML parsing. 7. Engage with the eyoucms vendor or community to obtain patches or updates as soon as they become available. 8. Prepare incident response plans specifically addressing XXE and DoS scenarios to reduce downtime. 9. Consider deploying rate limiting on POST requests to reduce the risk of automated exploitation. 10. Conduct penetration testing and vulnerability scanning focused on XML processing to identify residual risks.