CVE-2026-106280 in Chrome
Summary
by MITRE • 10/06/2026
Incorrect authorization in PermissionElement in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially bypass web origin policy 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 PermissionElement component of Google Chrome prior to version 155.0.8059.39 represents a significant breach in browser-based access control mechanisms. This issue stems from a logic error or misconfiguration in how the browser evaluates and enforces permissions associated with specific web origins. In modern web architectures, browsers rely on strict origin policies to isolate content from different sources, ensuring that scripts running on one domain cannot arbitrarily read data or interact with elements belonging to another domain without explicit consent. The PermissionElement serves as a critical interface for managing these granular access rights, such as permissions for geolocation, camera, microphone, and notifications. When this component fails to correctly validate the authorization state of an origin, it creates a pathway for attackers to circumvent these protective boundaries.
From a technical perspective, the flaw allows a remote attacker to exploit the misconfigured permission checks by crafting a malicious HTML page designed to trigger unauthorized access sequences. By leveraging specific browser behaviors or race conditions within the PermissionElement logic, an attacker can trick the browser into believing that a cross-origin request is authorized when it should be denied. This bypass of the web origin policy effectively undermines the same-origin policy, which is foundational to web security. The exploitation typically involves social engineering tactics where a victim visits a malicious site or interacts with embedded content that executes scripts attempting to access restricted resources from a target domain. Because the browser incorrectly grants these permissions based on flawed internal state management, sensitive data such as cookies, local storage contents, or DOM elements can be exfiltrated without user intervention or proper consent dialogs appearing correctly.
The operational impact of this vulnerability is severe for users relying on Chrome for secure browsing activities involving banking, email, or corporate intranets. An attacker successfully exploiting this flaw could perform cross-site scripting attacks that are more potent than traditional variants because they operate with elevated privileges granted by the browser itself rather than just script execution capabilities. This can lead to account takeover through session hijacking, theft of personally identifiable information stored in local storage, and potential further compromise if combined with other vulnerabilities like cross-site request forgery weaknesses. The medium severity rating assigned by Chromium reflects that while exploitation requires user interaction or a crafted page, the consequences are substantial due to the fundamental nature of the policy bypass involved.
To mitigate this risk, users must upgrade Google Chrome immediately to version 155.0.8059.39 or later where these authorization checks have been corrected and hardened against such bypass techniques. For organizations deploying Chromium-based browsers across endpoints, it is imperative to enforce automatic update policies to ensure all instances are patched promptly upon release of security fixes. Additionally, implementing Content Security Policy headers can provide an additional layer of defense by restricting the sources from which scripts and other resources can be loaded, thereby reducing the attack surface even if a browser-level vulnerability exists. Monitoring for unusual network traffic patterns originating from local web processes may also help in detecting potential exploitation attempts in real-time environments where patching delays might occur.
This incident aligns with Common Weakness Enumeration category CWE-269, which covers Improper Authorization, specifically highlighting failures in enforcing access control policies within software components. It also maps to MITRE ATT&CK techniques related to Browser Security Misconfiguration and potentially Cross-Site Scripting if the bypass leads to script injection capabilities that were previously blocked by origin checks. Understanding these mappings helps security teams prioritize remediation efforts based on standardized frameworks, ensuring that similar architectural flaws in other web applications or browser components are identified and addressed proactively rather than reactively after an incident occurs.