CVE-2026-87593 in Chrome
Summary
by MITRE • 09/09/2026
Information leak in Editing in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an information leak within the editing component of Google Chrome, specifically affecting versions prior to 153.0.8010.36, represents a classic case of sensitive data exposure through improper handling of user interface state and memory contents. This flaw allows a remote attacker to retrieve confidential information that should remain isolated from untrusted web content. The root cause typically lies in the browser's rendering engine or input method editor subsystems failing to properly sanitize or clear temporary buffers, clipboard data, or internal object states after an editing operation is completed or aborted. When a user interacts with rich text fields, password managers, or other sensitive inputs within a webpage, the underlying Chromium architecture may retain references to previously entered data or intermediate processing states in memory locations that are accessible via JavaScript APIs if specific conditions are met. This creates a side-channel through which malicious scripts can probe and extract this residual information without direct user interaction beyond visiting the crafted page.
From a technical perspective, this vulnerability aligns with CWE-200, which categorizes exposure of sensitive information to an unauthorized actor. The attack vector is classified as remote because it requires no authentication or physical access; instead, it relies on social engineering tactics where a victim is coerced into visiting a maliciously crafted HTML page hosted by the attacker. This scenario maps directly to MITRE ATT&CK technique T1005, which describes data from local system extraction, and more specifically T1213, data from information repositories, as the attacker exploits the browser's own mechanisms for storing or processing input data against its intended security boundaries. The severity is rated as low because while it compromises confidentiality, it generally does not allow for remote code execution or direct control over the victim's system, limiting the impact to potential credential theft or session hijacking if combined with other vectors like cross-site scripting.
The operational impact of this vulnerability centers on privacy violations and potential account compromise. An attacker leveraging this flaw could potentially extract auto-filled form data, previously typed passwords that were not properly cleared from memory buffers, or sensitive text entered into rich text editors before the page was navigated away from. In enterprise environments where Chrome is used for internal applications handling proprietary information, such leaks can lead to significant intellectual property loss or regulatory non-compliance with standards like GDPR or HIPAA if personal health information or personally identifiable information is exposed. The low severity rating reflects that mitigations are straightforward and the exploit complexity is moderate due to browser-specific memory layout variations and potential countermeasures implemented in newer versions, but it remains a critical concern for users who have not updated their browsers promptly.
Mitigation strategies primarily involve immediate software updates. Administrators should ensure all Chrome instances are upgraded to version 153.0.8010.36 or later, where the editing component's memory management and data sanitization routines have been patched to prevent unauthorized access to internal states. For environments unable to update immediately, network-level controls such as strict Content Security Policy directives can help mitigate some risks by restricting script execution origins, although this is not a complete solution for client-side rendering flaws. Additionally, users should be educated on the importance of clearing browsing data regularly and avoiding interaction with untrusted web pages that request sensitive input. Monitoring browser logs for unusual memory access patterns or excessive clipboard interactions may also aid in detecting exploitation attempts in real-time within monitored enterprise networks.