CVE-2026-11276 in Chrome
Summary
by MITRE • 06/05/2026
Inappropriate implementation in Cast in Google Chrome prior to 149.0.7827.53 allowed an attacker on the local network segment to bypass discretionary access control via malicious network traffic. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a discretionary access control bypass issue within Google Chrome's casting implementation that existed prior to version 149.0.7827.53. The flaw resides in how Chrome handles network traffic related to casting functionality, specifically allowing unauthorized access when an attacker can manipulate network packets on the same local network segment. The vulnerability stems from insufficient validation of network traffic originating from casting operations, creating a potential pathway for malicious actors to circumvent normal access controls that should normally restrict casting capabilities to authorized users or devices within the network.
The technical implementation flaw occurs within Chrome's network stack handling of casting protocols, where the application fails to properly authenticate or validate incoming network traffic that may originate from unauthorized sources. This represents a classic case of inadequate input validation and network traffic filtering that allows malicious actors to inject crafted packets that can manipulate the casting behavior. The vulnerability operates at the network protocol level where casting functionality relies on local network communication, making it accessible to attackers who can observe or manipulate traffic on the same subnet. The low severity classification from Chromium security team suggests the impact is limited to access control bypass rather than full system compromise, though it still represents a significant security gap in the application's network security model.
The operational impact of this vulnerability extends beyond simple access control bypass as it could enable attackers to intercept or manipulate casting sessions, potentially gaining access to content being streamed or controlled through the casting interface. An attacker positioned on the local network segment could exploit this vulnerability to inject malicious content into casting sessions or potentially redirect casting traffic to unauthorized endpoints. This could result in unauthorized access to media content, potential exposure of sensitive information being cast to displays, or even manipulation of smart home devices that rely on casting protocols for control. The vulnerability is particularly concerning in enterprise environments where casting functionality might be used for presentations or collaborative work sessions, as it could allow unauthorized access to confidential information.
Mitigation strategies should focus on implementing network segmentation to isolate casting traffic from general network traffic, deploying network access control lists to restrict casting protocol communication, and ensuring all Chrome installations are updated to version 149.0.7827.53 or later. Organizations should also consider implementing network monitoring solutions that can detect anomalous casting traffic patterns and establish proper network hygiene practices such as disabling casting features when not required. From a compliance perspective, this vulnerability aligns with CWE-284 which addresses improper access control, and could potentially be leveraged as part of broader attack chains that follow ATT&CK technique T1071.004 for application layer protocol traffic filtering. Network administrators should also consider implementing additional security controls such as encrypted casting protocols where available, and ensuring that network devices properly enforce access control policies for casting-related traffic. The vulnerability highlights the importance of secure network design principles and proper implementation of access control mechanisms in network-facing applications, particularly those that handle multimedia content transmission and control functions.