CVE-2026-87600 in Chrome
Summary
by MITRE • 09/09/2026
Improper input validation in Safebrowsing in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an improper input validation flaw within the Safebrowsing component of Google Chrome for Android prior to version 153.0.8010.36 represents a significant deviation from expected secure coding practices regarding user-supplied data handling. This specific defect allows a remote attacker, who typically relies on social engineering tactics such as phishing or malicious link distribution, to bypass system access restrictions imposed by the operating environment. The core technical issue lies in the browser's failure to adequately sanitize or validate inputs processed during safe browsing checks, which are designed specifically to protect users from navigating to known harmful websites. By crafting a specific HTML page that exploits this validation gap, an attacker can manipulate the internal state of the Safebrowsing service, effectively tricking it into permitting access to content that should have been blocked or restricted by security policies.
From a technical perspective, this flaw aligns with CWE-20 Improper Input Validation and potentially CWE-749 Exposed Dangerous Method if the bypass involves invoking privileged functions without proper authorization checks. The attack vector is classified as remote because it requires no local access to the victim's device; instead, it leverages standard web technologies delivered over a network connection. The reliance on social engineering indicates that while the technical exploit exists, its success depends heavily on user interaction, such as clicking a malicious link or loading a compromised webpage. This characteristic places the vulnerability within the ATT&CK framework under techniques related to Initial Access and potentially Execution if the bypass leads to further code execution capabilities, although the primary impact described is the circumvention of access controls rather than direct privilege escalation.
The operational impact of this vulnerability is substantial for mobile users who depend on Chrome's Safebrowsing feature as a first line of defense against web-based threats. By bypassing system access restrictions, an attacker can potentially expose the user to drive-by downloads, credential harvesting pages, or other malicious payloads that would normally be intercepted and blocked by Google’s threat intelligence services. This undermines the integrity of the browsing session and compromises the security posture of the Android device, as users may inadvertently grant permissions or download malware under the false assumption that they are visiting a safe site. The medium severity rating assigned by Chromium reflects this balance between the ease of exploitation via social engineering and the potential for significant data compromise if successful.
Mitigation strategies primarily involve updating to Google Chrome version 153.0.8010.36 or later, which contains patches addressing these input validation deficiencies within the Safebrowsing module. Users should ensure that automatic updates are enabled to receive security fixes promptly without manual intervention. Additionally, organizations deploying Android devices in enterprise environments should enforce strict application control policies and utilize mobile device management solutions to monitor for unauthorized browser modifications or suspicious network traffic patterns indicative of such exploitation attempts. Security awareness training remains critical given the social engineering component, as technical controls alone cannot fully mitigate risks associated with user deception.