CVE-2026-87554 in Chrome
Summary
by MITRE • 09/09/2026
Race condition in Chromoting in Google Chrome on on Windows prior to 153.0.8010.36 allowed a local attacker to execute arbitrary code outside the sandbox via a local program. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as CVE-2024-7934 represents a critical race condition within the Chromoting component of Google Chrome on Windows operating systems prior to version 153.0.8010.36. This flaw allows a local attacker with limited privileges to execute arbitrary code outside the browser's sandbox environment, effectively bypassing one of the primary security mechanisms designed to contain malicious activity. The severity is classified as High by Chromium standards due to the potential for full system compromise through privilege escalation from a low-privileged context to that of the current user or potentially higher depending on the execution context of the compromised process.
At its core, this vulnerability stems from improper synchronization handling within the Chromoting module, which facilitates remote desktop and screen sharing functionalities. A race condition occurs when two or more threads access shared data concurrently, and at least one thread modifies the data without proper locking mechanisms to ensure atomicity. In this specific instance, the timing window between checking a security state and acting upon it is exploited by an attacker who can trigger rapid, concurrent operations via a local program. By carefully crafting the sequence of events, the attacker forces the application into an inconsistent state where safety checks are bypassed or rendered ineffective, allowing unauthorized code execution in a context that should be restricted.
The operational impact of this vulnerability is significant because it undermines the principle of least privilege inherent in modern browser architectures. Chrome employs a multi-process architecture with strict sandboxing to isolate web content from the underlying operating system. When an attacker successfully exploits this race condition, they can escape these sandboxes and execute code with elevated permissions. This capability enables the installation of malware, theft of sensitive data stored locally, modification of system configurations, or use of the compromised machine as a pivot point for further network attacks. The ability to run arbitrary code outside the sandbox means that traditional defenses such as application whitelisting or restricted user profiles may be circumvented if they rely on process isolation rather than deeper kernel-level protections.
From an industry standard perspective, this vulnerability aligns with CWE-362, which describes concurrent execution race conditions leading to unintended behavior. The exploitation technique also maps closely to MITRE ATT&CK techniques related to privilege escalation and defense evasion, specifically those involving local exploits for persistence or elevation of privileges on Windows systems. Attackers often leverage such vulnerabilities in the initial stages of an intrusion chain to gain a foothold that allows them to move laterally within a network or escalate their access level to administrative rights.
Mitigation strategies primarily involve immediate patching by updating Google Chrome to version 153.0.8010.36 or later, which addresses the synchronization issues in the Chromoting component. For environments where immediate patching is not feasible, administrators should consider disabling remote desktop features if they are not actively used, thereby reducing the attack surface associated with the vulnerable module. Additionally, enforcing strict application control policies and monitoring for unusual process creation events can help detect attempts to exploit this vulnerability before successful execution occurs. Regular security audits and keeping all software components up to date remain essential practices in maintaining a robust defense against such race condition-based exploits.