CVE-2025-14284 identifies a Cross-site Scripting (XSS) vulnerability in the @tiptap/extension-link package, a widely used extension for the Tiptap rich-text editor framework. Versions prior to 2.10.4 fail to sanitize user input when setting or toggling hyperlink elements, specifically allowing injection of javascript: URL schemes. This unsanitized input can be crafted by an attacker to embed arbitrary JavaScript code within link attributes. When a user interacts with such a malicious link, the embedded script executes within the application's security context, potentially compromising user data or session integrity. The vulnerability is exploitable remotely over the network without requiring authentication, but it does require user interaction to trigger the payload. The CVSS 4.0 vector (AV:N/AC:L/AT:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:P) indicates low attack complexity and no privileges needed, but user interaction is mandatory. Although no active exploitation has been reported, the vulnerability poses a risk to any web application embedding this package, especially those allowing users to input or modify link content. The vulnerability was published on December 9, 2025, and the fix is available in version 2.10.4 and later. The lack of known exploits suggests a window for proactive remediation. This vulnerability highlights the importance of rigorous input validation and output encoding in web components handling user-generated content.

For European organizations, this vulnerability can lead to significant security risks including theft of authentication tokens, session hijacking, defacement, or redirection to malicious sites. Organizations using @tiptap/extension-link in customer-facing or internal collaborative applications may inadvertently expose users to malicious scripts. The impact on confidentiality and integrity is moderate, as attackers can execute arbitrary scripts but only after user interaction. Availability impact is low. The vulnerability could be leveraged in targeted phishing or social engineering campaigns to compromise user accounts or inject malware. Sectors such as finance, healthcare, and government, which rely heavily on secure web applications, could face reputational damage and regulatory consequences if exploited. The medium CVSS score reflects these moderate but non-trivial risks. Since the vulnerability is in a frontend component, the attack surface is broad but requires user engagement, somewhat limiting mass exploitation. However, given the widespread use of Tiptap in modern web apps, the potential scope is considerable.

The primary mitigation is to upgrade the @tiptap/extension-link package to version 2.10.4 or later, where the vulnerability is patched. Organizations should audit their codebases and dependencies to identify affected versions. Additionally, implement strict input validation to reject or sanitize any user-supplied URLs, especially those containing javascript: schemes or other executable content. Employ robust output encoding on all link attributes to prevent script execution. Use Content Security Policy (CSP) headers to restrict the execution of inline scripts and untrusted sources. Educate developers on secure coding practices related to user input handling in rich-text editors. Conduct thorough security testing of web applications incorporating this package, including penetration testing focused on XSS vectors. Monitor for suspicious user activity that could indicate exploitation attempts. Finally, maintain an up-to-date inventory of frontend dependencies to rapidly respond to newly disclosed vulnerabilities.