CVE-2026-8564 in Chrome
Summary
by MITRE • 05/15/2026
Incorrect security UI in Downloads in Google Chrome on Android and Mac prior to 148.0.7778.168 allowed a remote attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 05/22/2026
This vulnerability represents a critical user interface spoofing issue within Google Chrome's download handling mechanism across Android and macOS platforms. The flaw stems from insufficient validation of download prompts and their associated security indicators, allowing malicious actors to craft HTML pages that manipulate the visual presentation of download notifications. Attackers could exploit this weakness by creating deceptive download interfaces that appear legitimate while actually directing users to malicious content or phishing sites. The vulnerability specifically affects Chrome versions prior to 148.0.7778.168, indicating a targeted window of exposure for users running outdated browser versions.
The technical implementation of this UI spoofing attack involves manipulating the browser's download dialog presentation layer to display false security warnings or misleading download sources. This type of attack leverages the principle of visual deception where users are tricked into believing they are interacting with a trusted download process while actually encountering malicious content. The vulnerability operates at the application layer of the browser's security model, specifically targeting the user interface components responsible for download confirmation and security alerts. This flaw falls under the category of CWE-611, which addresses Improper Restriction of XML External Entity Reference, though more specifically relates to user interface security validation failures.
The operational impact of this vulnerability extends beyond simple phishing attempts to encompass broader security risks including credential theft, malware distribution, and unauthorized data access. Users interacting with compromised download pages could unknowingly install malicious software, provide sensitive information to fraudulent sites, or be redirected to content that compromises their system integrity. The attack vector requires no local privileges or complex exploitation techniques, making it particularly dangerous as it can be executed through simple web browsing activities. This vulnerability directly impacts the browser's security model by undermining the user's ability to distinguish between legitimate and malicious download operations, effectively weakening the security boundary that should exist between the user and potentially harmful content.
Mitigation strategies for this vulnerability require immediate patching of affected Chrome versions to 148.0.7778.168 or later, which includes enhanced validation of download prompts and improved security UI rendering. Organizations should implement proactive browser update policies and consider deploying automated patch management solutions to ensure timely remediation. Users should be educated about the importance of verifying download sources and recognizing suspicious UI elements, though this represents a secondary defense since the vulnerability operates at the application level rather than user awareness. Additional protective measures include implementing network-based filtering solutions that can detect and block known malicious download patterns, as well as maintaining regular security assessments of browser configurations to identify potential UI manipulation risks. The remediation process should also include monitoring for any reported incidents of successful UI spoofing attacks that may have occurred during the vulnerable period, enabling organizations to respond appropriately to potential compromise scenarios. This vulnerability demonstrates the critical importance of maintaining up-to-date browser security implementations and highlights the need for continuous monitoring of user interface security aspects within modern web browsers.