CVE-2026-17818 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Network 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 issue that existed in Google Chrome versions prior to 151.0.7922.72, specifically within the network component handling of web content. The flaw allowed remote attackers to execute arbitrary scripts or HTML code through carefully crafted malicious pages, demonstrating a critical weakness in the browser's input sanitization and content processing mechanisms. The vulnerability falls under the category of Unintended Cross-Site Scripting (UXSS) as defined by the CWE-79 framework, which specifically addresses situations where user-controllable data enters a web application and is subsequently executed as script code without proper validation or encoding.
The technical implementation flaw stems from insufficient sanitization of network-related content within Chrome's rendering engine, particularly when processing HTML elements that should be treated as safe or neutral. Attackers could craft malicious HTML pages that would bypass existing security controls, allowing them to inject executable JavaScript or HTML code that would execute in the context of the victim's browsing session. This vulnerability operates at the intersection of multiple security domains including web application security, browser sandboxing, and content security policies, making it particularly dangerous as it can be leveraged for session hijacking, credential theft, or redirection to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution as it represents a significant threat vector for advanced persistent threats and social engineering attacks. When exploited, the vulnerability allows attackers to manipulate browser behavior in ways that can persist across sessions and potentially compromise user data, especially when combined with other vulnerabilities or attack vectors. The medium severity classification according to Chromium security standards does not fully capture the potential damage that can occur through UXSS exploitation, as these vulnerabilities often serve as initial access points for more sophisticated attacks within the ATT&CK framework.
Mitigation strategies should prioritize immediate patching of affected Chrome versions to ensure users are protected against this specific vulnerability. Organizations should implement comprehensive web application firewalls and content security policies that restrict script execution from untrusted sources. Browser security configurations should be audited regularly, with emphasis on strict content sanitization rules and proper input validation mechanisms. Security teams should monitor for indicators of compromise related to suspicious network traffic patterns and unauthorized script injection attempts. The vulnerability highlights the importance of maintaining up-to-date software versions and implementing defense-in-depth strategies that include regular security assessments, user education about phishing risks, and monitoring systems capable of detecting anomalous behavior patterns associated with cross-site scripting attacks.
This particular vulnerability demonstrates how seemingly minor implementation flaws in browser components can create significant security risks. The issue emphasizes the critical need for robust input validation and sanitization processes throughout web application architectures, particularly in areas where network data is processed and rendered. Organizations must maintain vigilance against similar vulnerabilities by implementing comprehensive security testing procedures including automated scanning, manual penetration testing, and regular security audits to identify potential attack vectors before they can be exploited by malicious actors.