Description

Insufficient validation of untrusted input in UI in Google Chrome prior to 151.0.7922.109 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.3",
  "pubDate": "2026-08-06T22:17:00.263Z",
  "pubdate": "2026-08-06T22:17:00.263Z",
  "executiveSummary": "A high-severity vulnerability involving insufficient validation of untrusted input in the user interface has been identified in Google Chrome prior to version 151.0.7922.109.\nThis flaw allows a remote attacker who has already successfully compromised the renderer process to potentially execute a sandbox escape using a specifically crafted HTML page.\nThe vulnerability directly affects the security boundary mechanisms of Google Chrome and Chromium-based browsers, presenting significant risk implications by potentially granting the attacker unauthorized access to the underlying operating system or system resources outside the confines of the isolated browser sandbox.\nExploitation requires the attacker to first achieve code execution within the renderer process, typically by luring a user to a malicious web page, followed by the delivery of a crafted HTML payload designed to exploit the input validation weakness within the browser user interface component.\nSuccessful exploitation compromises the defense-in-depth architecture of the browser, elevating the threat level from a contained renderer compromise to potential host-level system interaction.",
  "technicalDetails": "The root cause of the vulnerability stems from insufficient validation of untrusted input processed within the user interface (UI) subsystem of Google Chrome and the underlying Chromium engine.\nThe affected component is specifically the browser UI handling logic, which fails to properly sanitize or validate data originating from or manipulated by untrusted contexts.\nThe affected software versions include all Google Chrome releases prior to 151.0.7922.109.\nAuthentication requirements are absent, and network exposure is inherent to standard web browsing capabilities, as the attack vector relies on content processed over the network.\nPrivilege requirements dictate that the attacker must already maintain control over the renderer process, typically achieved via an initial remote code execution vulnerability within the browser engine.\nThe attack flow proceeds in multiple stages. Initially, the attacker compromises the renderer process by exploiting a memory corruption or logic flaw while rendering malicious web content. Once the renderer is compromised, the attacker leverages the renderer's capability to interact with browser UI processes or IPC (Inter-Process Communication) channels.\nBy supplying a crafted HTML page containing malicious inputs targeted at the UI handling routines, the attacker exploits the lack of rigorous input validation.\nThe payload manipulates the UI component in an unintended manner, exploiting logic flaws to break out of the security sandbox constraints.\nPost-exploitation impact includes a successful sandbox escape, allowing the attacker to transition from the restricted renderer sandbox environment to executing operations with the privileges of the browser process or potentially interacting directly with the host operating system, depending on subsequent privilege escalation chains."
}