CVE-2026-17776 in Chrome
Summary
by MITRE • 07/30/2026
Policy bypass in Receiver in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical policy enforcement failure within Google Chrome's receiver component that existed prior to version 151.0.7922.72. The issue stems from insufficient validation mechanisms in the browser's architecture that govern how incoming data is processed and handled within the sandboxed environment. The flaw allows for a sophisticated attack vector where an adversary who has already compromised the renderer process can exploit this weakness to escape the intended security boundaries of the sandbox. This represents a significant escalation risk as it transforms a compromised renderer into a potential full system compromise opportunity.
The technical implementation of this vulnerability involves the receiver component failing to properly validate or sanitize incoming policy decisions that flow through the browser's communication channels. When a malicious HTML page is loaded, it can manipulate the receiver's behavior in ways that bypass established security policies designed to prevent unauthorized access to system resources. This weakness specifically affects how Chrome processes external communications and handles trust relationships between different browser components, creating a pathway for privilege escalation attacks. The vulnerability operates at the intersection of multiple security domains including process isolation, memory management, and inter-process communication protocols.
From an operational perspective, this vulnerability presents a serious threat to organizations relying on Chrome as their primary browser solution, particularly in environments where sandboxing is considered a critical defense mechanism. The medium severity classification reflects the fact that exploitation requires prior compromise of the renderer process, but the potential impact is severe as it can lead to complete system compromise. Attackers can leverage this vulnerability to bypass the fundamental security model that Chrome employs to isolate potentially malicious content from the underlying operating system. This allows for privilege escalation attacks that could result in unauthorized access to sensitive data, system control, or further network reconnaissance.
The mitigation strategy for this vulnerability requires immediate deployment of Chrome version 151.0.7922.72 or later, which includes patches addressing the policy validation issues in the receiver component. Organizations should also implement comprehensive monitoring for suspicious browser behavior and ensure that all user sessions are regularly updated with security patches. The fix addresses the root cause by strengthening the validation mechanisms within the receiver module and ensuring proper enforcement of access control policies. This vulnerability aligns with CWE-284 which specifically addresses improper access control issues, and represents a potential technique in the ATT&CK framework under privilege escalation tactics where attackers leverage software vulnerabilities to gain elevated system privileges.
Security teams should conduct thorough assessments of their browser security posture and ensure that all endpoints are updated promptly to prevent exploitation attempts. The vulnerability demonstrates the importance of maintaining robust security boundaries within complex software architectures and highlights the critical need for continuous security testing of inter-component communication mechanisms. Organizations should also consider implementing additional security controls such as application whitelisting and network monitoring to detect potential exploitation attempts even if the primary patch is not immediately deployed.