CVE-2025-62585 is a security vulnerability identified in the NAVER Whale browser, specifically affecting versions before 4.33.325.17. The vulnerability is categorized under CWE-358, which relates to improperly implemented security checks. In this case, the flaw allows an attacker to bypass the Content Security Policy (CSP), a critical browser security feature designed to prevent cross-site scripting (XSS) and data injection attacks. The bypass occurs via a specific scheme when the browser is operating in a dual-tab environment, suggesting that the interaction between tabs can be manipulated to circumvent CSP enforcement. This could allow malicious actors to execute unauthorized scripts or load malicious resources that should have been blocked by CSP. The vulnerability does not require prior authentication but does require user interaction, specifically involving the dual-tab scenario. Although no known exploits are currently reported in the wild, the nature of the vulnerability indicates a significant risk if weaponized. The absence of a CVSS score limits precise severity quantification, but the potential for CSP bypass is a serious concern given CSP's role in protecting web applications and users from code injection attacks. NAVER Whale is a Chromium-based browser primarily popular in South Korea but has a growing user base internationally, including in Europe. The vulnerability's impact extends to confidentiality and integrity of data processed or displayed in the browser, potentially enabling phishing, session hijacking, or data theft. The lack of an official patch at the time of publication necessitates immediate attention from users and administrators to monitor updates and apply mitigations.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of web-based communications and data. Attackers exploiting the CSP bypass could inject malicious scripts, leading to credential theft, session hijacking, or unauthorized data access. This is particularly concerning for sectors handling sensitive information such as finance, healthcare, and government services. The dual-tab requirement means that user interaction is necessary, but given common browsing behaviors, this is not a high barrier. The absence of known exploits currently reduces immediate risk, but the potential for future exploitation remains high. Organizations relying on NAVER Whale browser for internal or external web access could face targeted attacks, especially if threat actors craft sophisticated social engineering campaigns to exploit this flaw. The vulnerability could also undermine trust in web applications protected by CSP, increasing the attack surface for phishing and malware distribution campaigns within European enterprises.

1. Immediate mitigation involves advising users to avoid using NAVER Whale browser for sensitive operations until a patched version is released. 2. Monitor NAVER’s official channels for security updates and apply patches promptly once available. 3. Implement strict Content Security Policies on web applications to minimize the impact of CSP bypass, including using nonce or hash-based CSP directives. 4. Educate users about the risks of interacting with multiple tabs from untrusted sources simultaneously. 5. Employ browser security controls such as disabling or restricting the use of schemes that could be exploited in dual-tab scenarios. 6. Use endpoint protection solutions capable of detecting anomalous browser behaviors indicative of exploitation attempts. 7. Consider deploying alternative browsers with robust and updated security postures for critical workflows until the vulnerability is resolved.