CVE-2026-121081 in Chrome
Summary
by MITRE • 11/03/2026
UI misrepresentation in Passwords in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to obtain sensitive information via crafted network traffic. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified as UI misrepresentation in the password management subsystem of Google Chrome versions prior to 157.0.8103.38 represents a sophisticated attack vector that exploits human-computer interaction flaws rather than traditional code execution errors. This issue, classified with low severity by the Chromium security team, does not involve direct memory corruption or remote code execution but instead focuses on deceiving the user interface to manipulate user perception and behavior. The core technical flaw lies in how Chrome renders password-related information during authentication processes, specifically when handling network traffic that has been crafted or intercepted by an attacker. By manipulating the visual presentation of login fields or credential prompts, the vulnerability allows a remote actor to create a false sense of security or urgency, leading users to inadvertently disclose sensitive credentials. This type of flaw is particularly dangerous because it bypasses technical controls such as encryption and access restrictions by targeting the human element in the security chain.
From a technical perspective, this misrepresentation likely involves discrepancies between the actual domain context being authenticated and the visual cues presented to the user within the browser interface. Attackers can leverage social engineering techniques combined with crafted network traffic to present a phishing page that appears legitimate or trustworthy due to subtle UI manipulations. For instance, an attacker might alter the display of URL bars, lock icons, or password input fields to mimic trusted sites while actually capturing data on a malicious domain. The browser fails to correctly validate and display the true origin of the authentication request against what is visually presented, creating a trust gap that users are likely to fall into. This aligns with CWE-203, which describes observable response discrepancy where an application provides different information in its responses than expected, potentially leading to security misinterpretations by the user or system components relying on those cues.
The operational impact of this vulnerability is significant despite its low severity rating because it facilitates credential theft through social engineering rather than automated exploitation. A remote attacker can conduct targeted phishing campaigns where victims are tricked into entering their passwords into a compromised interface that looks authentic due to the UI misrepresentation. Once credentials are harvested, they can be used for unauthorized access to personal accounts, corporate systems, or financial services. The attack chain typically involves delivering malicious links via email or messaging platforms, followed by intercepting and modifying network traffic to ensure the phishing page displays correctly within Chrome’s interface. This makes detection difficult as the browser itself is not crashing or behaving erratically; instead, it is functioning exactly as programmed but with misleading visual outputs that exploit user trust in the browser's security indicators.
This vulnerability maps directly to MITRE ATT&CK technique T1566.002, which covers Spearphishing Links under the Initial Access tactic. The attacker uses a crafted link or network interaction to deliver content that exploits UI misrepresentation, thereby gaining initial access by stealing credentials. Additionally, it relates to CWE-798, Use of Hard-coded Credentials, in the context where users are tricked into providing their own hard-coded personal passwords because they believe they are interacting with a legitimate service protected by Chrome’s security features. The reliance on social engineering means that technical patches alone may not fully mitigate the risk without accompanying user education and enhanced visual verification mechanisms within the browser itself.
Mitigation strategies primarily involve updating Google Chrome to version 157.0.8103.38 or later, where these UI rendering issues have been addressed by the Chromium team. Users should ensure automatic updates are enabled to receive security patches promptly. Beyond software updates, organizations and individuals must implement multi-factor authentication wherever possible to reduce reliance on passwords alone. Security awareness training is critical to help users recognize subtle signs of phishing attempts that might exploit such UI flaws, even when the browser interface appears normal. Network monitoring tools can also be configured to detect anomalies in traffic patterns associated with known phishing domains or unusual certificate presentations during login sequences. Regular audits of security policies and continuous vigilance against social engineering tactics remain essential defenses alongside technical remediation efforts.