CVE-2026-87538 in Chrome
Summary
by MITRE • 09/09/2026
Clickjacking in Input in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process and leveraged social engineering 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 clickjacking in input fields within Google Chrome prior to version 153.0.8010.36 represents a sophisticated user interface deception technique that exploits the browser's rendering engine and interaction model. This flaw allows an attacker, who has already achieved partial compromise of the renderer process or can inject malicious content into it, to manipulate how input elements are displayed on top of legitimate web pages. By leveraging social engineering tactics, the attacker crafts HTML pages designed to overlay transparent or semi-transparent frames over trusted interfaces, tricking users into interacting with hidden controls rather than the visible UI elements they perceive themselves to be clicking. This specific variant targets input fields, which are critical for data entry and authentication processes, thereby increasing the potential severity of the deception despite the Chromium security team classifying it as low severity due to the prerequisite renderer compromise.
From a technical perspective, this vulnerability relies on the ability to manipulate the z-index stacking context and opacity properties within HTML documents loaded in iframes or similar containers. The attacker positions malicious input fields directly over legitimate ones, often making them invisible while still capturing user interactions such as keystrokes or mouse clicks. When a victim attempts to enter sensitive information like passwords or credit card numbers into what appears to be the correct field on a trusted website, their inputs are actually directed toward the hidden, attacker-controlled element. This mechanism bypasses standard browser security checks because it operates within the legitimate rendering context of the page, exploiting the trust users place in the visual representation of web interfaces rather than breaking out of sandbox boundaries through traditional code execution exploits.
The operational impact of this vulnerability centers on credential theft and unauthorized actions performed under the guise of user consent. Since the attack requires social engineering to lure victims into visiting a crafted webpage or interacting with embedded content, it is highly targeted in nature. However, once executed successfully, it can lead to significant data breaches where sensitive authentication credentials are exfiltrated directly from the compromised renderer process before being transmitted to an external server controlled by the attacker. This undermines the fundamental security principle of user intent, as actions taken by the victim do not align with their actual intentions or understanding of the interface they are using. The low severity rating reflects the difficulty in achieving initial access via renderer compromise but does diminish the potential damage if such a foothold is obtained through other means like drive-by downloads or malicious extensions.
In terms of industry standards, this vulnerability maps closely to CWE-1021: Improper Restriction of Rendered UIs or Layers (Clickjacking), which describes flaws where user interface elements are manipulated to deceive users into performing unintended actions. It also aligns with MITRE ATT&CK technique T1536: Substitute Input Mechanism, specifically the subtechnique involving iframe overlays for input capture. These classifications highlight that while the exploit vector is complex and requires significant setup by the attacker, it remains a persistent threat in modern web environments where cross-origin interactions are common. The vulnerability underscores the importance of robust frame-busting techniques and strict content security policies to prevent unauthorized framing of sensitive pages.
Mitigation strategies primarily involve updating Google Chrome to version 153.0.8010.36 or later, which includes patches that reinforce restrictions on how input elements can be layered over other UI components. Developers should implement X-Frame-Options headers set to DENY or SAMEORIGIN and utilize Content Security Policy directives such as frame-ancestors to prevent their sites from being embedded in malicious iframes. Additionally, employing browser-level protections like site isolation features helps limit the impact of renderer compromises by ensuring that processes are strictly segregated based on origin. Users should remain vigilant against suspicious links and avoid entering sensitive data into pages loaded within unfamiliar or untrusted contexts, as these measures collectively reduce the attack surface available for such deceptive techniques.