CVE-2026-121115 in Chrome
Summary
by MITRE • 11/03/2026
Improper input validation in Shopping in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass system access restrictions into a privileged page via crafted network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as an improper input validation flaw within the Shopping component of Google Chrome prior to version 157.0.8103.38 represents a significant breach in boundary enforcement mechanisms designed to isolate web content from privileged browser interfaces. This specific defect allows a remote attacker, through the delivery of crafted network traffic or maliciously constructed web pages, to bypass system access restrictions that are intended to prevent untrusted code from interacting with sensitive internal APIs or UI elements. The core technical failure lies in the insufficient sanitization and validation of user-supplied data before it is processed by privileged components, enabling an injection-like attack vector where malformed inputs trigger unintended execution paths within higher-privilege contexts.
From a technical perspective, this flaw aligns closely with CWE-20 Improper Input Validation, as the application failed to correctly verify that input met expected constraints regarding type, length, format, or range before processing. Furthermore, the ability of an attacker to bypass access controls and interact with privileged pages maps directly to ATT&CK technique T1610, which involves Exploitation for Browser Execution via Renderers. By exploiting this weakness, an adversary can potentially escalate privileges within the browser sandbox environment, moving from a low-privilege renderer process to one that holds elevated permissions or access to sensitive user data and system resources. This bypass undermines the fundamental security model of modern browsers, which relies on strict isolation between untrusted web content and trusted browser chrome.
The operational impact of this vulnerability is substantial for end-users who rely on Chrome for secure browsing activities involving financial transactions or personal information storage within shopping contexts. An attacker could leverage this flaw to perform actions such as stealing session cookies, accessing saved payment credentials, or manipulating the user interface to deceive users into revealing additional sensitive data. Because the attack vector involves remote network traffic, it can be delivered via phishing campaigns, drive-by downloads, or compromised advertising networks without requiring any physical access or local configuration changes by the victim. The medium severity rating assigned by Chromium reflects the potential for privilege escalation and unauthorized access, though it may indicate that certain mitigating factors like sandboxing layers might partially limit immediate system compromise compared to critical-severity flaws.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 157.0.8103.38 or later immediately upon availability. Patch management processes should prioritize browser updates due to the high prevalence of web-based attack vectors targeting these components. Additionally, implementing strict Content Security Policy headers can help restrict how scripts interact with privileged pages, although this is a defense-in-depth measure rather than a replacement for patching. Users should also exercise caution when visiting unfamiliar websites and utilize security extensions that monitor for anomalous browser behavior or unauthorized access attempts to sensitive areas of the interface. Regular auditing of installed extensions is recommended as they can sometimes exacerbate input validation issues if not properly sandboxed themselves.