CVE-2025-52662 is a cross-site scripting (XSS) vulnerability identified in Vercel's Nuxt DevTools, specifically affecting version 2.6.3. The flaw arises from improper sanitization of input or output in the DevTools interface, which under certain configurations allows an attacker to execute malicious scripts in the context of the user's browser session. This XSS can be leveraged to extract Nuxt authentication tokens, which are critical for maintaining session integrity and access control within Nuxt-based applications. The vulnerability requires user interaction, such as clicking a crafted link or visiting a malicious page, and has a high attack complexity due to the need for specific configurations. The CVSS v3.1 score of 6.9 reflects a medium severity, with network attack vector, high attack complexity, no privileges required, and user interaction needed. The impact on confidentiality is limited, but the integrity impact is high because stolen tokens can allow attackers to impersonate users or escalate privileges. Availability is not affected. The vulnerability was reserved in June 2025 and publicly disclosed in November 2025, with a fix released in Nuxt DevTools version 2.6.4. No known exploits have been reported in the wild, but the risk remains for organizations that have not updated. The vulnerability is categorized under CWE-79, which covers improper neutralization of input leading to XSS.

For European organizations, the primary impact of CVE-2025-52662 is the potential compromise of authentication tokens used in Nuxt.js applications, which can lead to unauthorized access, session hijacking, and potential privilege escalation within development or staging environments. This could result in unauthorized code changes, data manipulation, or exposure of sensitive development data. While the vulnerability does not directly affect production availability, the integrity of development workflows and application security could be undermined, increasing the risk of supply chain attacks or introduction of malicious code. Organizations with active web development teams using Nuxt DevTools are at higher risk, especially if the vulnerable version is used in environments accessible to untrusted users or external networks. The medium severity and lack of known exploits suggest a moderate immediate threat, but the potential for token theft and subsequent misuse warrants prompt remediation. Additionally, organizations subject to strict data protection regulations like GDPR must consider the implications of unauthorized access and potential data breaches stemming from compromised tokens.

1. Upgrade Nuxt DevTools to version 2.6.4 or later immediately to apply the official patch addressing the XSS vulnerability. 2. Restrict access to Nuxt DevTools interfaces to trusted internal networks and authenticated users only, minimizing exposure to untrusted or external users. 3. Implement Content Security Policy (CSP) headers to reduce the risk of XSS exploitation by restricting the sources of executable scripts. 4. Conduct regular code reviews and security testing of development tools and environments to detect and remediate similar vulnerabilities early. 5. Monitor logs and network traffic for unusual activities indicative of token theft or unauthorized access attempts. 6. Educate developers and users about the risks of clicking on untrusted links or interacting with suspicious content while using development tools. 7. Consider implementing token expiration and rotation policies to limit the window of opportunity for attackers if tokens are compromised. 8. Use multi-factor authentication (MFA) where possible to add an additional layer of security beyond token-based authentication.