CVE-2026-87649 in Chrome
Summary
by MITRE • 09/09/2026
UI misrepresentation in Downloads in Google Chrome prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to bypass system access restrictions 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 UI misrepresentation in the downloads interface of Google Chrome prior to version 153.0.8010.36 represents a significant trust boundary violation within the browser's user experience layer. This flaw specifically affects how file download information is presented to the end-user, creating a discrepancy between what the system reports and what the attacker intends or achieves through social engineering tactics. The core of this issue lies in the deceptive presentation of downloaded files, where the visual cues provided by the browser do not accurately reflect the true nature, origin, or potential danger of the file being saved to the local machine. By manipulating these interface elements, an adversary can obscure malicious intent behind seemingly benign download notifications, thereby lowering the user's vigilance and increasing the likelihood that they will interact with a compromised artifact without realizing the associated risks.
From a technical perspective, this vulnerability exploits weaknesses in how Chrome handles metadata display during the file saving process. When a web page triggers a download via HTML or JavaScript mechanisms, the browser typically displays information such as the filename, source URL, and sometimes security warnings if applicable. In vulnerable versions of Chrome, an attacker leveraging social engineering can craft an HTML page that manipulates these displayed attributes to mislead the user. For instance, the interface might display a trusted-looking domain name while the actual file originates from a malicious server, or it may hide critical warning indicators that would normally alert the user to potential security threats. This manipulation allows the attacker to bypass system access restrictions and user expectations by exploiting the cognitive gap between perceived safety and actual risk. The severity is classified as medium because while it does not directly compromise browser internals like memory management, it effectively neutralizes one of the primary defense layers: informed user consent based on accurate information.
The operational impact of this vulnerability extends beyond simple data theft to include broader system compromise scenarios facilitated by human error. An attacker can use this UI deception to trick users into downloading and executing malicious payloads such as trojans, ransomware, or remote access tools under the guise of legitimate software updates, documents, or media files. Since modern operating systems often rely on user interaction for execution decisions regarding downloaded content, misleading interface elements significantly increase the success rate of drive-by download attacks and phishing campaigns. This type of attack is particularly dangerous because it targets the human element rather than a technical exploit in code logic, making traditional signature-based detection methods less effective. The ability to bypass system access restrictions implies that even if endpoint protection solutions are active, they may not trigger alerts until after the user has already initiated execution or opened the file, giving the attacker a foothold within the network environment.
This vulnerability aligns closely with CWE-200: Information Exposure and CWE-798: Use of Hard-coded Credentials in contexts where trust is misappropriated through interface deception. More specifically, it falls under ATT&CK technique T1566.001: Phishing: Spearphishing Attachment, as well as aspects of T1059 Command and Scripting Interpreter if the downloaded file leads to script execution. The attack vector relies heavily on social engineering principles, where psychological manipulation is used to bypass technical controls. To mitigate this risk, users are advised to upgrade Google Chrome immediately to version 153.0.8010.36 or later, which addresses these UI inconsistencies and ensures that download prompts accurately reflect file origins and security statuses. Additionally, organizations should enforce strict browser policies that disable automatic downloads for untrusted sources and enable enhanced phishing protection features within the Chromium engine. Security awareness training remains critical to help users recognize subtle discrepancies in interface behavior that may indicate malicious activity, ensuring that even if such UI manipulations occur, the human layer of defense can still identify and report suspicious download attempts before execution occurs.