CVE-2026-79106 in Chrome
Summary
by MITRE • 08/26/2026
Improper input validation in Input in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified in Google Chrome prior to version 152.0.7977.65 represents a critical failure in input validation mechanisms within the browser's rendering engine. This flaw specifically affects how the user agent processes certain inputs, creating an opportunity for attackers who have already achieved partial control over the renderer process environment. The severity of this issue is classified as medium by Chromium security standards, indicating that while it does not allow direct arbitrary code execution from a clean state, it significantly degrades the isolation guarantees provided by the browser's sandbox architecture.
The core technical flaw lies in the improper validation of input data passed to specific internal functions or APIs within the renderer process. When an attacker compromises the renderer process through other means, such as exploiting a separate vulnerability or leveraging malicious extensions, they can inject crafted HTML content into this environment. The lack of rigorous checks on these inputs allows the attacker to manipulate how the browser interprets subsequent commands or data structures. This manipulation is not merely about executing code but rather about altering the context in which that code operates, specifically targeting the boundaries between different security zones within the application.
The operational impact of this vulnerability centers on the bypassing of web origin policies. Origin policy enforcement is a fundamental security mechanism designed to prevent malicious scripts from accessing data associated with another origin, such as cookies, local storage, or DOM elements belonging to a different domain. By exploiting this input validation error, an attacker can craft HTML pages that trick the browser into treating content from one origin as if it belongs to another trusted origin. This effectively neutralizes the Same-Origin Policy (SOP), allowing cross-origin data theft and unauthorized interactions with web applications that rely on these boundaries for security.
This attack vector aligns closely with ATT&CK techniques related to privilege escalation within a sandboxed environment, specifically those involving abuse of browser features or APIs to escape isolation. It also corresponds to CWE-20 Improper Input Validation, where the software does not sufficiently verify input before processing it. The requirement for social engineering indicates that this vulnerability is typically part of a multi-stage attack chain. An attacker must first gain access to the renderer process, often through phishing or drive-by downloads, and then leverage this specific flaw to escalate their capabilities from isolated script execution to full cross-origin data access.
Mitigation strategies primarily involve updating Google Chrome to version 152.0.7977.65 or later, where these input validation checks have been strengthened. For organizations managing large fleets of browsers, automated patch management systems should be configured to prioritize this update due to its potential for facilitating data exfiltration attacks. Additionally, security teams should enforce strict Content Security Policy (CSP) headers across web applications served by their domains. A robust CSP can mitigate the impact of such origin bypasses by restricting which sources are allowed to execute scripts or load resources, thereby reducing the effectiveness of crafted HTML pages even if they manage to exploit this specific renderer-side flaw.