CVE-2026-87483 in Chrome
Summary
by MITRE • 09/09/2026
Incorrect authorization in Browser in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker 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 incorrect authorization flaw within the browser component of Google Chrome on Android, specifically affecting versions prior to 153.0.8010.36, represents a significant breach in access control mechanisms. This issue stems from a failure in the application logic to properly validate user privileges or session states when processing requests initiated by web content. In this context, the browser engine failed to enforce strict boundaries between different security contexts, allowing a remote attacker to manipulate the authorization flow. By crafting a specific HTML page that exploits these logical gaps, an adversary can trick the browser into executing actions or accessing resources that should be restricted under normal system access policies. This type of flaw is particularly dangerous because it relies on social engineering combined with technical exploitation, where the victim must interact with the malicious content for the attack to succeed.
From a technical perspective, this vulnerability aligns closely with CWE-269, which describes Improper Privilege Assignment. The core issue lies in the browser's inability to correctly map user roles or permissions to specific actions requested by web pages. When a crafted HTML page is loaded, it likely triggers an API call or internal function that checks for authorization but fails to verify if the current context has sufficient rights to perform the operation. This oversight allows the attacker to bypass system access restrictions, potentially gaining unauthorized visibility into sensitive data or altering application state in ways intended only for privileged users or protected contexts. The severity is rated as Medium by Chromium security standards because while it does not typically allow direct code execution on the device kernel level, it compromises the integrity and confidentiality of browser-based interactions and can lead to further exploitation chains such as cross-site scripting or data exfiltration if combined with other vulnerabilities.
The operational impact of this vulnerability extends beyond simple unauthorized access. An attacker leveraging this flaw could potentially bypass security features designed to protect user privacy, such as restrictions on accessing device sensors, location services, or stored credentials. By manipulating the authorization checks, the malicious HTML page can execute scripts that interact with protected APIs without proper consent or validation from the operating system. This undermines the trust model of the browser and exposes users to risks including session hijacking, data theft, and unauthorized modifications to web application states. For enterprise environments relying on Chrome for secure browsing, this flaw poses a risk to corporate data if employees are tricked into visiting malicious sites that exploit these authorization gaps.
To mitigate the risks associated with this vulnerability, immediate action is required to update Google Chrome on Android devices to version 153.0.8010.36 or later, where these access control checks have been hardened and corrected. Organizations should enforce automatic updates for all corporate-managed devices to ensure that security patches are applied promptly as they become available. Additionally, users should be educated about the dangers of visiting untrusted websites and interacting with unknown HTML content, even if it appears benign. Implementing strict Content Security Policies (CSP) in web applications can also help reduce the attack surface by limiting which scripts and resources are allowed to execute within the browser context. Monitoring for unusual network traffic or unauthorized API calls from browser processes may provide early detection of exploitation attempts before significant damage occurs.
This incident highlights the critical importance of rigorous input validation and authorization checks in complex software like web browsers, where multiple layers of security must work in concert to protect user data. The ATT&CK framework categorizes such behaviors under techniques involving initial access or privilege escalation via browser vulnerabilities, emphasizing that even medium-severity flaws can be pivotal components in broader attack campaigns. Maintaining up-to-date software and adhering to secure coding practices are essential defenses against these types of logical errors that undermine system integrity.