CVE-2026-87496 in Chrome
Summary
by MITRE • 09/09/2026
UI misrepresentation in Browser in Google Chrome prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as a user interface misrepresentation flaw within the Chromium-based Google Chrome browser prior to version 153.0.8010.36 represents a significant risk related to trust boundaries and visual integrity. This specific class of vulnerabilities, often categorized under CWE-204 Observable Response Discrepancy or more specifically CWE-798 Use of Hard-coded Credentials if it involves spoofing authentication prompts, allows an attacker to manipulate the browser's rendering engine to display deceptive user interface elements. The core technical flaw lies in how the browser processes and renders HTML content that attempts to mimic legitimate system dialogs, address bars, or security indicators. By leveraging crafted HTML pages containing specific CSS properties, JavaScript DOM manipulations, or iframe injection techniques, an attacker can overlay fake login prompts, certificate warnings, or download notifications over genuine page content. This creates a visual discrepancy where the user perceives they are interacting with a trusted entity while actually engaging with malicious code controlled by the remote server.
The operational impact of this vulnerability is primarily centered around social engineering effectiveness rather than direct system compromise through buffer overflows or memory corruption. Because the browser itself does not crash or execute arbitrary shellcode directly via this flaw, the severity is classified as medium within the Chromium security framework. However, the potential for data exfiltration and credential theft remains high due to the psychological manipulation involved. An attacker can create a phishing page that appears identical to popular services such as banking portals, email providers, or enterprise single sign-on systems. When users interact with these spoofed elements, they may inadvertently submit sensitive information like usernames, passwords, multi-factor authentication codes, or session cookies directly to the attacker's infrastructure. This undermines the fundamental security model of web browsers which relies on visual cues to help users distinguish between secure and insecure contexts.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK technique T1078 Valid Accounts if used in conjunction with stolen credentials obtained through such spoofing, or more accurately T1566 Phishing where the lure is designed to deceive based on visual fidelity. The attack vector requires user interaction, specifically clicking on a crafted link and then interacting with the deceptive UI elements presented by the browser. This necessitates that the victim be tricked into visiting the malicious site, often through email campaigns or compromised websites. While modern browsers have implemented various mitigations such as origin isolation and strict content security policies, sophisticated attackers continue to find edge cases in rendering engines where visual spoofing remains possible before patches are deployed.
Mitigation strategies for this vulnerability focus on timely patch management and user awareness training. Organizations should ensure that all endpoints running Google Chrome or Chromium-based browsers are updated to version 153.0.8010.36 or later, which contains the necessary fixes to prevent these UI spoofing techniques from rendering correctly. Additionally, implementing browser hardening policies such as disabling JavaScript for untrusted sites via group policy can reduce the attack surface, although this may impact usability. Security awareness programs should educate users on verifying URL consistency and looking for subtle discrepancies in font rendering or layout that might indicate a spoofed interface. Furthermore, deploying endpoint detection and response solutions capable of monitoring for unusual network connections following visits to suspicious domains can help detect post-exploitation activity resulting from successful social engineering attacks leveraging this flaw.