CVE-2026-106260 in Chrome
Summary
by MITRE • 10/06/2026
Incorrect authorization in DevTools in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization flaw within the DevTools 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 failure to properly enforce security boundaries when handling requests or data interactions initiated through developer tools interfaces that are accessible via web pages under specific conditions. While DevTools is primarily intended for debugging and development purposes, its integration into the broader Chromium architecture means it can be invoked by maliciously crafted content if certain permissions or contexts allow such access. The core technical flaw lies in the insufficient validation of origin checks during cross-origin data retrieval operations facilitated through these tools. When a remote attacker constructs an HTML page designed to exploit this misconfiguration, they can trick the browser into exposing sensitive information that should remain isolated within its original security context. This type of error is classically categorized under CWE-269, which denotes Improper Privilege Management, specifically where the system fails to restrict actions based on user roles or origins, leading to unauthorized data access.
The operational impact of this vulnerability centers on the potential leakage of cross-origin data, a critical security property known as Same-Origin Policy (SOP) enforcement failure. By leveraging social engineering techniques, an attacker can persuade a victim to visit a specially crafted webpage that triggers the vulnerable DevTools functionality. Once activated, the flaw allows the malicious script to bypass standard isolation barriers and read sensitive content from other domains hosted within the same browser instance. This could include personal information, session tokens, or proprietary data stored in local storage or accessible via web APIs. The severity is rated as low by Chromium security standards because successful exploitation requires active user interaction through social engineering rather than purely automated remote code execution. However, even with this lower rating, the risk remains substantial for users who frequently interact with untrusted content while having developer tools enabled or exposed in certain contexts.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK technique T1059.007, which covers JavaScript-based command execution and data exfiltration via browser scripts. The attacker utilizes the victim's own environment to extract information, relying on the trust relationship between the user and their browsing session. To mitigate such risks, it is essential for users to keep their browsers updated to the latest stable release where these authorization checks have been hardened. Additionally, security best practices dictate disabling developer tools in production environments or restricting access through enterprise policies when not actively debugging. Organizations should also implement Content Security Policy (CSP) headers that limit script execution origins and monitor for unusual patterns of cross-origin data requests. Regular audits of web application permissions and strict adherence to principle of least privilege principles further reduce the attack surface available to adversaries attempting to exploit similar authorization flaws in future browser versions.