Description

Improper input validation in Omnibox in Google Chrome prior to 152.0.7977.75 allowed a remote attacker leveraging social engineering to bypass web origin policy via crafted network traffic. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-09-02T00:18:29.627Z",
  "pubdate": "2026-09-02T00:18:29.627Z",
  "executiveSummary": "A high-severity security vulnerability exists within the Google Chrome Omnibox, identified as improper input validation.\nThis vulnerability allows a remote attacker to circumvent web origin policy restrictions, fundamentally compromising the browser's Same-Origin Policy (SOP).\nAffected products include Google Chrome versions prior to 152.0.7977.75.\nThe risk implication is significant, as it enables unauthorized cross-origin interactions that could lead to sensitive data exfiltration, session hijacking, or the execution of malicious scripts within the context of a trusted origin.\nExploitation requires the attacker to employ social engineering tactics to induce a user into interacting with crafted network traffic, potentially redirecting or misleading the browser's navigation logic.\nGiven the nature of the Omnibox as a trusted entry point for navigation and URL parsing, this flaw poses a critical threat to user security and data privacy.\nUsers and administrators are strongly advised to update to version 152.0.7977.75 or later to mitigate the risk of exploitation.",
  "technicalDetails": "The root cause of this vulnerability lies in insufficient input validation and sanitization protocols within the Google Chrome Omnibox component. The Omnibox acts as a critical interface for both URL entry and search queries, serving as a gatekeeper for navigation requests. When the browser fails to properly validate the input processed by the Omnibox, it creates an ambiguity in how the browser interprets and resolves destination origins.\nThe exploitation flow initiates when an attacker delivers crafted network traffic to a user, typically facilitated by social engineering maneuvers. By manipulating the input string handled by the Omnibox, an attacker can influence the browser's navigation logic to incorrectly associate a malicious or attacker-controlled resource with a legitimate site's origin. This process effectively bypasses the web origin policy, which is a foundational security mechanism designed to isolate content from different domains.\nIn a successful exploitation scenario, the crafted traffic induces the browser to process a request that masquerades as an authorized action within the scope of a legitimate domain. Because the Omnibox is a privileged component, the resulting misinterpretation of origin boundaries allows the attacker to execute cross-origin requests that would otherwise be blocked by the Same-Origin Policy. Consequently, the browser may treat the malicious interaction as if it originated from a trusted source.\nThis vulnerability affects Google Chrome versions prior to 152.0.7977.75. The flaw is not dependent on local authentication or elevated privileges; rather, it relies on the browser's inherent trust in the input provided via the Omnibox. The network exposure is high, as the vulnerability can be triggered via standard web-based interactions initiated by a remote attacker.\nPost-exploitation, an attacker can leverage this bypass to perform actions such as accessing cookies, sensitive document content, or authentication tokens associated with the victim's session on a target domain. By effectively breaking the trust boundary established by the web origin policy, the attacker gains the ability to compromise the confidentiality and integrity of web sessions, facilitating further malicious activity within the victim's browser environment."
}