CVE-2025-57320 is a Prototype Pollution vulnerability found in the json-schema-editor-visual package, which is a tool used to provide a JSON Schema editor interface. The vulnerability exists in the setData and deleteData functions of versions up to 1.1.1. Prototype Pollution occurs when an attacker is able to inject or delete properties on JavaScript's Object.prototype by supplying a crafted payload. This manipulation can lead to unexpected behavior in applications that rely on the affected package. In this case, the minimum consequence identified is a denial of service (DoS), which can disrupt the normal functioning of applications using this package. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L) shows that the attack can be performed remotely over the network without any privileges or user interaction, impacting availability and causing limited confidentiality loss. No known exploits are currently reported in the wild, and no patches have been linked yet. The CWE associated is CWE-1321, which relates to improper handling of prototype pollution issues. Prototype Pollution vulnerabilities are particularly dangerous because they can alter the behavior of JavaScript objects globally, potentially leading to security bypasses, data corruption, or application crashes.

For European organizations, the impact of this vulnerability depends on the extent to which json-schema-editor-visual is used within their software stacks, particularly in web applications or internal tools that handle JSON schema editing. The ability to cause denial of service remotely without authentication means that attackers could disrupt critical services or development environments, leading to downtime and productivity loss. Although the confidentiality and integrity impacts are limited, the availability impact could affect business continuity, especially for organizations relying on real-time or continuous data validation and editing. Additionally, if attackers chain this vulnerability with others, it could potentially lead to more severe consequences. The lack of known exploits in the wild currently reduces immediate risk, but proactive mitigation is important to prevent future exploitation. European organizations in sectors such as software development, financial services, and critical infrastructure that use JavaScript-based tooling should be particularly vigilant.

1. Immediate mitigation involves auditing the use of json-schema-editor-visual in all applications and development environments to identify affected versions (up to 1.1.1). 2. Since no official patches are currently linked, organizations should monitor the package repository and security advisories for updates or patches addressing this vulnerability and apply them promptly once available. 3. As a temporary measure, consider implementing input validation and sanitization to prevent malicious payloads from reaching the vulnerable functions. 4. Employ runtime application self-protection (RASP) or web application firewalls (WAFs) that can detect and block suspicious payloads targeting prototype pollution. 5. Conduct code reviews and static analysis to detect unsafe usage of Object.prototype manipulation in custom code. 6. Educate developers about prototype pollution risks and secure coding practices to prevent similar vulnerabilities. 7. For critical systems, consider isolating or sandboxing components that use this package to limit the blast radius of potential attacks.