CVE-2026-17945 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Navigation in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical flaw in chrome's navigation handling mechanism that emerged from insufficient input validation within the browser's rendering pipeline. The issue specifically affected google chrome versions prior to 151.0.7922.72 and stemmed from the browser's failure to properly validate untrusted input during navigation operations. When an attacker successfully compromised the renderer process, they could leverage this weakness to execute UI spoofing attacks through carefully crafted HTML pages that manipulated the browser's navigation behavior.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation as a fundamental security weakness. The flaw occurred at the interface between user input processing and navigation handling within chrome's architecture, creating an attack vector where malicious content could influence how the browser presented its user interface. This particular weakness falls under the broader category of insufficient validation of untrusted data, a pattern that frequently appears in web application security vulnerabilities and has been documented extensively in security frameworks such as owasp top ten.
The operational impact of this vulnerability was significant for users operating affected chrome versions, as it provided a pathway for attackers who had already achieved renderer process compromise to escalate their privileges through user interface manipulation. UI spoofing attacks can be particularly dangerous because they exploit the trust users place in familiar browser interfaces, potentially leading to phishing attacks or credential theft when users are misled about the actual website they are visiting. The low chromium security severity classification does not diminish the practical implications for end users who might encounter such attacks in real-world scenarios.
Attackers exploiting this vulnerability could craft HTML pages that manipulated navigation behavior to display misleading interface elements, potentially tricking users into entering sensitive information or performing unintended actions. This attack vector represents a form of privilege escalation within the browser environment and demonstrates how seemingly minor input validation flaws can create substantial security risks when combined with other compromise techniques. The vulnerability specifically targeted chrome's renderer process, indicating that attackers needed to establish initial access through other means before leveraging this particular weakness.
Organizations should implement immediate mitigations including mandatory chrome updates to versions 151.0.7922.72 or later, which contain the necessary patches to address this input validation issue. Additional protective measures include implementing strict content security policies, monitoring for suspicious navigation patterns, and educating users about the risks of interacting with untrusted web content. Security teams should also consider deploying browser isolation technologies and maintaining comprehensive monitoring of renderer process activities to detect potential exploitation attempts. The fix typically involves strengthening input validation mechanisms within chrome's navigation handling code and ensuring that all user-provided data is properly sanitized before being processed in navigation contexts.
This vulnerability demonstrates the importance of defense-in-depth strategies in browser security, where multiple layers of protection are necessary to prevent attackers from leveraging seemingly small weaknesses into significant compromises. The attack pattern aligns with ATT&CK technique T1056.001 which describes input injection attacks that manipulate user interface elements to deceive users. Organizations should also consider implementing web application firewalls and browser security extensions that can detect and block suspicious navigation behaviors, particularly in environments where users may encounter untrusted content regularly.