CVE-2026-87624 in Chrome
Summary
by MITRE • 09/09/2026
UI misrepresentation in Passwords in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to spoof UI elements via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as a user interface misrepresentation in Google Chrome for Android prior to version 153.0.8010.36 represents a significant trust boundary violation within the browser's rendering engine architecture. This flaw specifically affects how UI elements are rendered and presented to the end-user when interacting with web content, particularly involving password fields or authentication prompts. The core technical issue stems from an inability of the renderer process to correctly isolate visual output from maliciously crafted HTML pages that attempt to overlay deceptive interface components over legitimate browser controls. By exploiting this discrepancy in rendering logic, a remote attacker can manipulate the perceived state of the user interface without actually gaining elevated privileges within the operating system or the browser's security sandbox. This type of vulnerability is classified under CWE-201 as an Insertion of Sensitive Information into Sent Data via UI Misrepresentation, where the integrity of the information presented to the user is compromised through visual deception rather than direct data exfiltration at that specific moment.
From a technical perspective, this flaw leverages the complex interaction between the browser's compositor and the web page content layer. When an attacker hosts a crafted HTML page on a malicious server, they can utilize CSS positioning, z-index manipulation, or other rendering techniques to create fake login dialogs, password entry fields, or security warnings that visually mimic Chrome’s native UI elements. Because the renderer process is already compromised or executing untrusted code due to prior exploitation of another vulnerability or through social engineering leading to initial access, it gains the ability to inject these deceptive layers into the view hierarchy. The browser fails to distinguish between legitimate chrome-level UI and web-content-driven overlays in this specific context, allowing the attacker’s visual elements to appear on top of or replace genuine prompts. This creates a situation where the user believes they are interacting with secure, official Chrome interfaces while actually inputting credentials into fields controlled by the malicious webpage.
The operational impact of this vulnerability is primarily centered around credential theft and phishing efficacy enhancement. Although the security severity is rated as Low within Chromium’s internal classification system due to the prerequisite of a compromised renderer process, the practical implications for end-users are severe if such an attack chain is successfully executed. An attacker who has achieved code execution in the renderer can use this UI spoofing technique to harvest usernames and passwords with high fidelity, bypassing user skepticism that might arise from obvious phishing sites. This aligns closely with MITRE ATT&CK tactic T1078, specifically valid accounts or credentials harvesting via deceptive interfaces, and falls under the broader category of social engineering attacks where visual trust is exploited. The attacker does not need to break encryption protocols or bypass sandbox restrictions further; they simply exploit the user’s reliance on familiar UI patterns to steal sensitive authentication data directly from the input fields before it can be securely transmitted or stored by the browser's password manager.
Mitigation for this vulnerability requires strict adherence to software update cycles, as Google has addressed these rendering inconsistencies in version 153.0.8010.36 and later releases of Chrome for Android. Users must ensure their browsers are updated promptly to patch known UI spoofing vectors that rely on legacy rendering behaviors. From a defense-in-depth perspective, organizations should enforce policies that prevent the execution of untrusted scripts in renderer processes through robust Content Security Policy implementations where applicable, although this specific flaw is more about visual presentation than direct data leakage during transmission. Additionally, user education remains critical; while technical controls are essential, users must be trained to verify URL bars and certificate details even when UI elements appear legitimate, as sophisticated attackers can combine such rendering flaws with other techniques to create highly convincing phishing scenarios that evade standard security awareness training.