CVE-2025-65836 is a newly published SSRF vulnerability affecting PublicCMS version V5.202506.b, specifically within the chat interface component of the SimpleAiAdminController. SSRF vulnerabilities occur when an attacker can manipulate a server-side application to send crafted requests to unintended locations, often internal network services or external systems that are otherwise inaccessible. In this case, the chat interface likely processes user input that is not properly sanitized or validated, allowing an attacker to specify arbitrary URLs or IP addresses for the server to contact. This can lead to unauthorized access to internal resources, data exfiltration, or pivoting attacks within the victim's network. The vulnerability was reserved on November 18, 2025, and published on December 1, 2025, but currently lacks a CVSS score and no public exploits have been reported. The absence of patch links suggests that a fix may not yet be available or publicly disclosed. The vulnerability's impact depends on the deployment context of PublicCMS, the network segmentation, and the presence of sensitive internal services accessible from the vulnerable server. SSRF can be leveraged to bypass firewalls, access metadata services in cloud environments, or interact with internal APIs, making it a critical security concern. The lack of authentication details in the report means it is unclear whether the vulnerability requires user authentication or can be exploited by unauthenticated attackers, but chat interfaces are often exposed to unauthenticated users, increasing risk. Given these factors, the vulnerability poses a significant threat to confidentiality and integrity, with potential availability impacts if used to trigger denial-of-service conditions.

For European organizations using PublicCMS V5.202506.b, this SSRF vulnerability could lead to unauthorized internal network access, exposing sensitive data or internal services. Attackers might exploit this flaw to access internal APIs, cloud metadata services, or other protected resources, potentially leading to data breaches or lateral movement within networks. Critical sectors such as government, finance, healthcare, and infrastructure that rely on PublicCMS for web content management or customer interaction could face increased risk. The vulnerability could also be used to bypass perimeter defenses, undermining network segmentation strategies common in European cybersecurity frameworks like NIS2. Additionally, exploitation could facilitate further attacks such as privilege escalation or ransomware deployment. The absence of known exploits currently reduces immediate risk, but the public disclosure increases the likelihood of future exploitation attempts. Organizations with exposed chat interfaces or insufficient outbound request controls are particularly vulnerable. The impact is heightened in environments where PublicCMS is integrated with other critical systems or where internal services lack robust authentication and authorization controls.

European organizations should immediately audit their PublicCMS deployments to identify instances running version V5.202506.b or similar vulnerable versions. Since no official patch is currently available, implement network-level controls to restrict outbound HTTP/HTTPS requests from the CMS server to only trusted destinations, using firewall rules or proxy configurations. Apply strict input validation and sanitization on all user-supplied data in the chat interface to prevent injection of malicious URLs. Employ web application firewalls (WAFs) with custom rules to detect and block SSRF attack patterns targeting the chat interface. Monitor logs and network traffic for unusual outbound requests originating from the CMS server, especially to internal IP ranges or cloud metadata endpoints. If possible, isolate the CMS server in a segmented network zone with limited access to sensitive internal resources. Engage with PublicCMS vendor or community to track patch releases and apply updates promptly once available. Conduct penetration testing focused on SSRF vectors in the chat interface to validate mitigations. Finally, educate development and security teams about SSRF risks and secure coding practices to prevent similar vulnerabilities in future CMS versions.