CVE-2026-17827 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in CSS in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a cross-site scripting flaw in Google Chrome's CSS implementation that could be exploited by remote attackers to execute arbitrary code within the context of a victim's browser. The issue stems from an insufficient validation mechanism in how Chrome processes certain CSS properties and their interactions with HTML content, creating a pathway for malicious actors to inject unauthorized scripts or HTML elements. The vulnerability specifically affects Chrome versions prior to 151.0.7922.72 and falls under the chromium security severity classification of medium impact.
The technical flaw manifests in the improper handling of CSS attribute values that can be manipulated through crafted HTML pages to bypass existing security controls. When Chrome processes certain combinations of CSS properties, it fails to adequately sanitize or validate input parameters, allowing attackers to inject malicious code that executes within the browser's context. This particular vulnerability enables what is known as a universal cross-site scripting attack where the malicious payload can potentially bypass traditional security measures such as content security policies and same-origin restrictions.
The operational impact of this vulnerability extends beyond typical XSS scenarios by providing attackers with the ability to manipulate web page content dynamically, potentially leading to session hijacking, data theft, or further exploitation of the victim's browser environment. Attackers could craft malicious web pages that appear legitimate but contain hidden CSS-based injection vectors capable of executing scripts in the context of any website visited by the vulnerable user. This creates a significant risk for users who browse untrusted websites or click on malicious links, as the attack can occur silently without user interaction beyond visiting the compromised page.
The vulnerability aligns with CWE-79 which describes improper neutralization of input during web page generation, specifically covering situations where applications fail to properly validate or sanitize data before incorporating it into web content. From an ATT&CK framework perspective, this maps to techniques such as T1059.001 for command and scripting interpreter and T1566 for phishing, as attackers could leverage this vulnerability to deliver malicious payloads through compromised web pages or social engineering campaigns. The medium severity classification indicates that while the attack requires specific conditions to be met, the potential impact on user security is significant enough to warrant immediate remediation.
Organizations should prioritize updating their Chrome installations to version 151.0.7922.72 or later to address this vulnerability. Additionally, implementing robust content security policies, enabling browser security features such as sandboxing, and conducting regular security assessments of web applications can help mitigate potential exploitation attempts. Security teams should also monitor for any related vulnerabilities in the Chromium codebase that might share similar underlying causes or patterns of exploitation.