CVE-2026-106418 in Chrome
Summary
by MITRE • 10/07/2026
Missing authorization in Network in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to bypass web origin policy via crafted network traffic. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as missing authorization within the network handling mechanisms of Google Chrome versions prior to 155.0.8059.39 represents a significant deviation from expected browser security boundaries, specifically concerning web origin policies. This flaw allows for the bypassing of same-origin restrictions through crafted network traffic, effectively undermining one of the core tenets of modern web application security which relies on isolating content from different sources to prevent unauthorized data access or interaction. The severity is classified as low by Chromium standards, yet the potential impact remains substantial depending on the specific context in which a victim interacts with maliciously constructed requests.
At its technical core, this vulnerability stems from an insufficient authorization check during network request processing. Web browsers enforce strict origin policies to ensure that scripts loaded from one domain cannot access or manipulate resources belonging to another unless explicitly permitted via mechanisms like Cross-Origin Resource Sharing headers. In this instance, the browser failed to properly validate whether a particular network operation was authorized by the originating context before executing it against external endpoints. This oversight creates an avenue for attackers to send requests that appear legitimate but carry unauthorized privileges or access rights relative to their origin point.
The operational impact of this flaw is heavily dependent on social engineering tactics, as indicated in the description. A remote attacker cannot simply exploit this vulnerability through passive means; they must actively lure a user into interacting with crafted network traffic. This typically involves tricking users into visiting malicious websites or clicking links that trigger specific browser behaviors exploiting the missing authorization check. Once triggered, an attacker could potentially read sensitive data from other origins, modify state-changing operations on behalf of the victim without proper consent checks, or exfiltrate information in ways that bypass standard security controls designed to prevent cross-site scripting and data leakage scenarios.
From a classification perspective, this issue aligns with CWE-284 Improper Access Control, as it involves an entity failing to properly restrict access to resources based on identity or privilege levels. Furthermore, the exploitation method relates closely to ATT&CK technique T1071 Application Layer Protocol, where adversaries use standard protocols like HTTP or HTTPS to communicate and execute attacks while evading detection by blending in with normal traffic patterns. The reliance on social engineering also ties into ATT&CK tactic TA0001 Initial Access, highlighting the human element as a critical vector for compromise even when technical controls are partially effective.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where these authorization checks have been reinforced and validated against edge cases involving complex network interactions. For organizations managing large fleets of devices, deploying automated patch management systems ensures timely application of such security updates across all endpoints. Additionally, implementing strict Content Security Policy headers can provide an additional layer of defense by restricting the sources from which content is allowed to load or execute, thereby reducing the attack surface even if a browser-level vulnerability exists. User education remains crucial as well, emphasizing caution when interacting with unfamiliar links or downloading files that might trigger unexpected network requests within the browser environment.