CVE-2025-52662 is a vulnerability identified in Vercel's Nuxt DevTools, specifically affecting version 2.6.3. The flaw enables an attacker to perform cross-site scripting (XSS) attacks that can lead to the extraction of Nuxt authentication tokens. This occurs under certain configurations where the devtools interface is exposed or insufficiently protected. The vulnerability allows an attacker to inject malicious scripts that execute in the context of the devtools, thereby stealing sensitive authentication tokens used for Nuxt applications. The CVSS v3.1 score is 6.9, indicating a medium severity level, with the vector indicating network attack vector (AV:N), high attack complexity (AC:H), no privileges required (PR:N), user interaction required (UI:R), scope changed (S:C), low confidentiality impact (C:L), high integrity impact (I:H), and no availability impact (A:N). The vulnerability was reserved in June 2025 and published in November 2025. No known exploits have been reported in the wild, but the risk remains significant for developers and organizations using the affected version. The issue was resolved in Nuxt DevTools version 2.6.4, and users are strongly encouraged to upgrade. The vulnerability primarily affects development environments where Nuxt DevTools are used, which are common in modern web application development workflows.

For European organizations, the vulnerability poses a risk primarily to the integrity of Nuxt-based web applications and their development environments. If exploited, attackers could extract authentication tokens, potentially leading to unauthorized access or manipulation of application states during development or debugging sessions. This could result in compromised application integrity, unauthorized code changes, or leakage of sensitive development credentials. While the confidentiality impact is limited, the integrity impact is high, which could disrupt development workflows and introduce malicious code into production if not detected. The vulnerability requires user interaction, typically by tricking a developer or user into triggering the malicious payload, which somewhat limits the attack surface but does not eliminate risk. Organizations relying heavily on Nuxt for web development, especially those with exposed or shared devtools environments, are at higher risk. The lack of known exploits in the wild suggests the threat is currently theoretical but should be addressed proactively to prevent future attacks. The vulnerability does not affect availability, so service disruption is unlikely. Overall, the impact is significant for development security and application integrity but limited for end-user systems.

1. Upgrade Nuxt DevTools to version 2.6.4 or later immediately to apply the official patch addressing this vulnerability. 2. Restrict access to Nuxt DevTools interfaces to trusted internal networks or authenticated users only, minimizing exposure to untrusted parties. 3. Implement strict Content Security Policies (CSP) to prevent execution of unauthorized scripts within development environments. 4. Educate developers and users about the risks of interacting with untrusted links or content while using devtools to reduce the chance of triggering malicious payloads. 5. Regularly audit and monitor development environments for unusual activity or unauthorized access attempts. 6. Consider isolating development tools from production environments to limit potential impact if a token is compromised. 7. Use secure token storage and rotation policies to minimize the window of opportunity for attackers if tokens are leaked. 8. Employ network segmentation and zero-trust principles around development infrastructure to reduce attack surface.