CVE-2026-17930
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Extensions in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to perform privilege escalation 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 Google Chrome's extension architecture that emerged from insufficient input validation mechanisms within the browser's extension handling components. The issue specifically affected versions prior to 151.0.7922.72 and stemmed from a fundamental weakness in how Chrome validated untrusted input originating from extension contexts. The vulnerability exploited a privilege escalation vector that could be triggered through a maliciously crafted HTML page, allowing an attacker who had already compromised the renderer process to gain elevated privileges within the browser environment.
The technical flaw manifests in Chrome's extension validation logic where untrusted data from web pages is not adequately sanitized or verified before being processed by extension components. This creates a pathway for malicious input to bypass normal security boundaries that should separate trusted extension code from potentially hostile user-generated content. The vulnerability operates at the intersection of browser sandboxing mechanisms and extension permission systems, where the renderer process compromise provides a foothold that can be leveraged to escalate privileges through improper input validation in extension handling code.
From an operational impact perspective, this vulnerability significantly undermines Chrome's security model by enabling attackers to elevate their privileges within the browser context. The low severity rating from Chromium security team belies the potential for serious consequences as it allows privilege escalation without requiring additional attack vectors beyond initial renderer compromise. This makes the vulnerability particularly dangerous in environments where attackers might already have limited access through other means, as it provides a clear path to gaining broader system privileges.
The vulnerability aligns with CWE-20, which describes improper input validation, and can be mapped to ATT&CK technique T1068, privilege escalation through exploitation of software vulnerabilities. Organizations should prioritize immediate patching to version 151.0.7922.72 or later to address this flaw. Additional mitigations include implementing strict content security policies, monitoring for unusual extension behavior, and maintaining updated browser security configurations. Security teams should also consider deploying network-based detection measures to identify potential exploitation attempts targeting this specific vulnerability in their environments.
The remediation approach requires comprehensive browser updates across all affected systems while maintaining awareness of similar validation flaws that might exist in other browser components or third-party extensions. Organizations should conduct security assessments to verify that no other input validation weaknesses exist within their browser deployment configurations, particularly focusing on extension and plugin handling mechanisms that might share similar architectural patterns with the vulnerable code paths identified in this vulnerability.