CVE-2025-6248 is a high-severity cross-site scripting (XSS) vulnerability identified in the Lenovo Browser. This vulnerability arises from improper neutralization of input during web page generation, classified under CWE-79. Specifically, the browser fails to adequately sanitize or encode user-controllable input embedded in web pages, allowing an attacker to inject malicious scripts. When a user visits a specially crafted web page containing this malicious content, the injected script executes in the context of the Lenovo Browser, potentially enabling the attacker to steal sensitive information such as cookies, session tokens, or other private data accessible to the browser. The CVSS 4.0 base score of 7.1 indicates a high severity, with the vector highlighting that the attack can be launched remotely (AV:N), requires no privileges (PR:N), and no user authentication (AT:N), but does require user interaction (UI:P), such as visiting a malicious or compromised web page. The vulnerability impacts confidentiality significantly (VC:H), while integrity and availability are not affected. No known exploits are currently reported in the wild, and no patches have been linked yet. The affected versions are not specified, which suggests that the vulnerability may affect multiple or all versions of the Lenovo Browser until fixed. This vulnerability is critical because browsers serve as gateways to the internet and handle sensitive user data, making exploitation a serious threat to user privacy and security.

For European organizations, the exploitation of this XSS vulnerability in Lenovo Browser could lead to unauthorized disclosure of sensitive information, including session cookies or authentication tokens, potentially enabling further attacks such as session hijacking or identity theft. Organizations relying on Lenovo devices with the Lenovo Browser as a default or secondary browser may face risks of data leakage, especially if employees visit untrusted or compromised websites. This could impact confidentiality of corporate data and user credentials, leading to potential breaches of GDPR regulations concerning personal data protection. Additionally, targeted spear-phishing campaigns exploiting this vulnerability could increase the risk of credential theft or lateral movement within corporate networks. The absence of known exploits currently provides a window for mitigation, but the high severity score and ease of exploitation (no privileges or authentication required) mean that organizations should act proactively. The vulnerability does not affect system integrity or availability directly but poses a significant risk to data confidentiality and user privacy.

European organizations should implement the following specific mitigations: 1) Immediately audit and inventory all Lenovo devices to identify those using the Lenovo Browser. 2) Restrict or disable the use of Lenovo Browser where possible, encouraging use of alternative browsers with robust security track records. 3) Implement strict web filtering and URL whitelisting to prevent access to untrusted or potentially malicious websites that could exploit this XSS vulnerability. 4) Educate users about the risks of clicking on unknown or suspicious links, emphasizing the importance of cautious browsing behavior. 5) Monitor network traffic and browser logs for unusual activity indicative of XSS exploitation attempts. 6) Stay alert for official Lenovo patches or updates addressing CVE-2025-6248 and apply them promptly once available. 7) Employ Content Security Policy (CSP) headers where feasible on corporate web applications to reduce the impact of XSS attacks. 8) Consider deploying endpoint security solutions capable of detecting and blocking script injection or anomalous browser behaviors. These targeted actions go beyond generic advice by focusing on device inventory, browser usage policies, user education, and proactive monitoring tailored to this specific vulnerability.