CVE-2026-17791 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Payments in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to perform UI spoofing 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 security flaw in Google Chrome's payment handling mechanism that emerged prior to version 151.0.7922.72. The issue stems from inadequate validation of untrusted input within the payments subsystem, creating a pathway for malicious actors to exploit compromised renderer processes. The vulnerability operates under CWE-20 which specifically addresses improper input validation, making it a fundamental weakness in the application's security architecture. When an attacker successfully compromises a renderer process through other means, they can leverage this flaw to execute UI spoofing attacks against users during payment transactions.
The technical exploitation involves crafting a malicious HTML page that manipulates how payment interfaces are displayed to users. This allows attackers to present fraudulent interfaces that mimic legitimate payment screens, potentially capturing sensitive user information such as credit card details or authentication credentials. The vulnerability specifically targets the renderer process which handles web content rendering, making it particularly dangerous since this is where most web-based attacks originate. The medium severity classification according to Chromium's security scoring system reflects the specific conditions required for exploitation, namely that the attacker must already have compromised the renderer process through prior attacks.
The operational impact of this vulnerability extends beyond simple data theft, as UI spoofing can lead to complete financial fraud and user deception. Users may unknowingly enter payment information into malicious interfaces that appear authentic, believing they are interacting with legitimate payment processors. This type of attack vector aligns with ATT&CK technique T1056.001 which covers credential harvesting through UI phishing. The vulnerability undermines the trust model of web browsers by allowing attackers to manipulate user interface elements even when the underlying browser engine is otherwise secure. Payment transactions become vulnerable to manipulation, potentially affecting millions of users who rely on Chrome for online commerce.
Organizations and users must immediately update to Chrome version 151.0.7922.72 or later to mitigate this risk, as the vulnerability requires no user interaction beyond visiting a malicious webpage. The fix implemented by Google addresses the input validation gap in the payments component, ensuring that untrusted HTML content cannot manipulate payment interface rendering. Security teams should monitor for indicators of compromise related to this vulnerability, particularly unusual payment processing behavior or attempts to access payment interfaces from unexpected sources. Additionally, network monitoring should detect potential malicious HTML content delivery targeting this specific vulnerability vector.