CVE-2026-106352 in Chrome
Summary
by MITRE • 10/07/2026
Incorrect authorization in WebProtect in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization flaw within the WebProtect component of Google Chrome prior to version 155.0.8059.39 represents a significant breach in access control mechanisms designed to safeguard user data and system integrity. This specific defect allows for unauthorized access or manipulation by external actors, fundamentally undermining the security boundaries established by the browser's architecture. The issue stems from a failure in the logic that governs how permissions are validated when interacting with protected resources, creating an avenue through which malicious entities can bypass intended restrictions. Such flaws are particularly dangerous because they often reside within core security features like WebProtect, which is responsible for detecting and blocking harmful content, thereby turning a defensive mechanism into a potential vector for exploitation if the underlying authorization checks are flawed.
From a technical perspective, this vulnerability falls under the category of improper access control, commonly referenced in industry standards as CWE-285: Improper Authorization. The flaw likely involves a situation where the application fails to properly verify that the user or process requesting an action has the necessary privileges for that specific resource. In the context of Chrome's WebProtect module, this could manifest as a failure to validate session tokens, permissions scopes, or contextual data before allowing access to sensitive internal states or APIs. The severity is classified as medium by Chromium security standards, indicating that while the vulnerability does not typically allow for direct remote code execution on its own, it provides critical capabilities that can be chained with other vulnerabilities or leveraged in conjunction with social engineering tactics to achieve more severe outcomes.
The operational impact of this vulnerability is primarily centered around information disclosure and potential compromise of user privacy. By leveraging a crafted HTML page, an attacker can exploit the authorization flaw to extract sensitive information from the browser environment. This process typically requires social engineering because modern browsers enforce strict same-origin policies and sandboxing that prevent arbitrary web pages from accessing local resources without explicit user interaction or permission grants. Therefore, the attack vector relies on tricking the victim into visiting a malicious site designed to trigger the flawed authorization logic. Once triggered, the crafted page can communicate with the vulnerable WebProtect component, potentially retrieving data such as browsing history, saved passwords, cookies, or other personally identifiable information that was intended to remain private and protected by the browser's security model.
This type of attack aligns closely with techniques observed in the MITRE ATT&CK framework, specifically those related to Collection via Browser Extension APIs or unauthorized access to local resources. The use of social engineering highlights the importance of user awareness alongside technical controls, as even robust software vulnerabilities can be effectively weaponized through psychological manipulation. Attackers may disguise malicious scripts within seemingly benign web content, relying on the victim's trust in legitimate-looking websites to initiate the exploit chain. The success of such an attack depends heavily on the specific implementation details of how WebProtect handles requests and validates their originators, but the presence of this flaw indicates a gap that sophisticated threat actors can target for data exfiltration campaigns.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Users are strongly advised to update Google Chrome to version 155.0.8059.39 or later, as these updates contain the necessary code fixes to correct the authorization logic within WebProtect. Beyond software updates, organizations should implement strict content security policies (CSP) and enable advanced phishing protection features to reduce the likelihood of users encountering malicious HTML pages that attempt to exploit such vulnerabilities. Additionally, regular audits of browser extensions and third-party scripts integrated into web applications can help identify potential weaknesses in authorization flows before they are exploited. Security teams should also monitor for indicators of compromise related to unusual data access patterns from browser processes, which may signal an active exploitation attempt against this or similar flaws.