CVE-2025-13631 is a vulnerability identified in the Google Updater component of Google Chrome on macOS platforms, affecting versions prior to 143.0.7499.41. The root cause is an inappropriate implementation within the updater, which processes files during the update procedure. A remote attacker can exploit this flaw by delivering a specially crafted file that triggers a privilege escalation, allowing the attacker to gain higher-level access on the affected system than originally permitted. This type of vulnerability is critical because the updater runs with elevated privileges to install browser updates, and compromising it can lead to full system compromise or persistent malware installation. The vulnerability was publicly disclosed on December 2, 2025, with no CVSS score assigned yet, and no known exploits have been reported in the wild. The lack of a CVSS score suggests the need for an independent severity assessment. The vulnerability affects only macOS versions of Chrome, which narrows the scope but still impacts a significant user base, especially in enterprise environments where Chrome is widely used. The attack vector involves remote delivery of a crafted file, which may be delivered via phishing, malicious downloads, or compromised websites. The flaw undermines the integrity and confidentiality of the system by allowing unauthorized privilege escalation. The recommended remediation is to update Chrome to version 143.0.7499.41 or later, where the issue has been fixed. Organizations should also audit their update mechanisms and monitor for suspicious activity related to the updater process.

For European organizations, this vulnerability poses a significant risk primarily to macOS users running vulnerable Chrome versions. Privilege escalation can lead to attackers gaining administrative control, enabling them to install persistent malware, exfiltrate sensitive data, or disrupt operations. Since Chrome is widely adopted in corporate environments across Europe, especially in sectors like finance, technology, and government, exploitation could lead to severe confidentiality and integrity breaches. The attack could bypass endpoint security if the updater is trusted and runs with elevated privileges. Additionally, organizations relying on automated update mechanisms may be vulnerable to supply chain attacks if the updater is compromised. The impact extends beyond individual users to potentially critical infrastructure and sensitive data environments. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly after disclosure. The vulnerability's focus on macOS limits exposure compared to cross-platform issues but still affects a substantial segment of European enterprises and professionals using Apple hardware.

European organizations should immediately verify the Chrome versions deployed on all macOS endpoints and prioritize upgrading to version 143.0.7499.41 or later. Implement strict patch management policies to ensure timely updates of browsers and related components. Monitor network traffic and endpoint logs for unusual activity related to the Google Updater process, including unexpected file executions or privilege escalations. Employ application whitelisting to restrict execution of unauthorized files and scripts, especially those targeting updater components. Conduct user awareness training to reduce the risk of phishing or social engineering attacks that could deliver crafted files. Use endpoint detection and response (EDR) solutions to detect and respond to suspicious privilege escalation attempts. Consider isolating macOS systems with sensitive data or critical roles to limit lateral movement in case of compromise. Review and harden update mechanisms to prevent tampering or unauthorized modifications. Finally, maintain up-to-date backups and incident response plans to mitigate potential damage from exploitation.