CVE-2025-62719 is a Server-Side Request Forgery (SSRF) vulnerability identified in Kovah's LinkAce, a self-hosted web link archiving tool. The issue exists in versions 2.3.0 and earlier within the htmlKeywordsFromUrl function of the FetchController class. This function accepts URLs provided by authenticated users and performs HTTP requests to those URLs without validating whether the target is an internal or private network resource. This lack of validation enables attackers with legitimate access to the application to coerce the server into making HTTP requests to internal IP addresses or services that are otherwise inaccessible externally. Consequently, attackers can conduct internal network reconnaissance activities such as port scanning and service discovery, potentially identifying vulnerable internal hosts or services. However, the practical impact is limited because the function only parses HTML meta keywords tags from the fetched content, which restricts the ability to exfiltrate sensitive data from internal databases, APIs, or cloud metadata endpoints. The vulnerability does not allow direct data extraction or remote code execution. The issue has been addressed and fixed in LinkAce version 2.4.0. The CVSS 4.0 vector indicates a low severity score of 2.3, reflecting network attack vector, high attack complexity, no user interaction, and limited impact on confidentiality, integrity, and availability. No known exploits have been reported in the wild, suggesting limited active exploitation. The vulnerability requires authenticated access, which reduces the attack surface but still poses a risk in environments where user credentials can be compromised or misused.

For European organizations, the impact of CVE-2025-62719 is generally low but should not be disregarded. Organizations using LinkAce versions prior to 2.4.0 may be exposed to internal network reconnaissance by authenticated users or attackers who have obtained valid credentials. This could facilitate lateral movement or further attacks by mapping internal services and ports that are not externally accessible. Although direct data exfiltration or system compromise is unlikely due to the limited scope of the function, the reconnaissance information could aid attackers in planning more targeted attacks against internal infrastructure. The risk is higher in environments with weak authentication controls or where LinkAce is accessible to a broad user base. Additionally, organizations with sensitive internal services or critical infrastructure behind the LinkAce server could face increased exposure. The absence of known exploits reduces immediate urgency, but the presence of the vulnerability in a self-hosted tool used for link management means that organizations should prioritize patching to maintain a strong security posture.

European organizations should take the following specific actions to mitigate CVE-2025-62719: 1) Upgrade LinkAce installations to version 2.4.0 or later, where the vulnerability is fixed. 2) Restrict access to the LinkAce application to trusted and authenticated users only, employing strong authentication mechanisms such as multi-factor authentication (MFA). 3) Implement network segmentation and firewall rules to limit the LinkAce server's ability to initiate HTTP requests to internal or sensitive network segments, effectively reducing the SSRF attack surface. 4) Monitor application logs for unusual URL fetch requests or patterns indicative of internal scanning or reconnaissance activities. 5) Conduct regular audits of user permissions within LinkAce to ensure only necessary users have access to URL fetching features. 6) Employ web application firewalls (WAFs) or intrusion detection systems (IDS) that can detect and block SSRF attempts or anomalous internal network requests originating from the LinkAce server. 7) Educate administrators and users about the risks of SSRF and the importance of applying security updates promptly. These measures go beyond generic advice by focusing on access control, network-level restrictions, and monitoring tailored to the specific behavior of the vulnerable function.