CVE-2025-11207 is a side-channel information leakage vulnerability identified in Google Chrome prior to version 141.0.7390.54. The vulnerability arises from improper handling of storage operations within the browser, specifically allowing a remote attacker to leverage crafted HTML pages to perform arbitrary read and write operations on the browser's storage mechanisms. This flaw is classified under CWE-125 (Out-of-bounds Read), indicating that the vulnerability involves accessing memory locations outside the intended bounds, which can lead to leakage of sensitive information and unauthorized data manipulation. The attack vector is remote and does not require any privileges or user interaction, making it accessible to any attacker who can lure a user to a malicious webpage. The CVSS v3.1 base score is 6.5, reflecting a medium severity level, with impact on confidentiality and integrity but no impact on availability. The vulnerability does not currently have known exploits in the wild, but the potential for arbitrary read/write access to browser storage could enable attackers to steal sensitive data such as cookies, tokens, or cached credentials, or to manipulate stored data to facilitate further attacks. The flaw affects all Chrome installations prior to the patched version 141.0.7390.54. The lack of a patch link in the provided data suggests that organizations should verify update availability directly from official Google channels. The vulnerability's exploitation requires only that a user visit a maliciously crafted webpage, emphasizing the importance of user awareness and web content filtering as additional defensive measures.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of sensitive data accessed or stored via Google Chrome. Since Chrome is widely used across enterprises and public sectors in Europe, exploitation could lead to unauthorized disclosure of session cookies, authentication tokens, or other sensitive information stored in the browser, potentially enabling account takeover or lateral movement within networks. The arbitrary write capability further increases risk by allowing attackers to manipulate stored data, which could corrupt application states or facilitate persistent attacks. Although availability is not impacted, the breach of confidentiality and integrity can result in regulatory non-compliance, especially under GDPR, leading to legal and financial repercussions. Organizations with high reliance on web applications and cloud services accessed through Chrome are particularly vulnerable. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly once details become public. The medium severity rating indicates that while the threat is not critical, it requires timely mitigation to prevent exploitation.

1. Immediately update all Google Chrome installations to version 141.0.7390.54 or later to apply the official patch addressing CVE-2025-11207. 2. Implement strict web content filtering and URL reputation services to block access to potentially malicious or untrusted websites that could host crafted HTML pages exploiting this vulnerability. 3. Employ browser security policies such as Content Security Policy (CSP) to restrict the execution of untrusted scripts and reduce the attack surface. 4. Educate users about the risks of visiting unknown or suspicious websites and encourage cautious browsing behavior. 5. Monitor network traffic and browser logs for unusual storage access patterns or anomalies indicative of exploitation attempts. 6. For high-security environments, consider deploying browser isolation technologies or sandboxing to contain potential attacks. 7. Coordinate with IT asset management to ensure all endpoints are inventoried and updated promptly. 8. Stay informed through official Google security advisories for any follow-up patches or mitigation guidance.