CVE-2026-17879 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Autofill in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data 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 significant information disclosure flaw in google chrome's autofill functionality that existed prior to version 151.0.7922.72. the issue stems from inadequate validation and sanitization of cross-origin data within the browser's autofill mechanisms, creating a pathway for malicious actors to exploit this weakness through carefully crafted html pages. the vulnerability manifests when chrome processes autofill data from different origins without proper isolation measures, potentially allowing attackers to access sensitive information that should remain confined to its originating domain. this type of flaw falls under the broader category of cross-site scripting vulnerabilities and specifically aligns with cwe-200 information exposure, where system information is inadvertently revealed to unauthorized parties.
the technical implementation flaw occurs within chrome's autofill subsystem where the browser fails to properly enforce same-origin policies when handling user data from multiple domains. when a malicious webpage loads content that triggers autofill behavior, the vulnerability enables data leakage across origin boundaries, potentially exposing personal information, form data, or other sensitive user inputs that were intended to remain isolated within their respective contexts. this cross-origin data leakage represents a violation of fundamental web security principles and allows attackers to aggregate information from multiple sources, creating a comprehensive profile of user activities and preferences. the medium severity classification indicates the vulnerability can be exploited remotely without requiring user interaction, making it particularly dangerous in automated attack scenarios.
the operational impact of this vulnerability extends beyond simple data exposure, as it undermines user privacy and browser security assumptions. attackers could leverage this flaw to collect sensitive information from users' autofill databases, potentially harvesting login credentials, personal details, or other confidential data that individuals expect to remain protected within their browser's secure environment. the implications are particularly concerning given that chrome's autofill system is designed to store and manage highly sensitive user information, making this vulnerability a prime target for exploitation in targeted attacks against specific users or organizations. such data leakage could enable more sophisticated attacks including credential theft, identity impersonation, or social engineering campaigns that rely on comprehensive user profiling.
mitigation strategies should focus on updating to the patched version of chrome 151.0.7922.72 or later, which implements proper cross-origin isolation controls for autofill functionality. system administrators should also consider implementing additional security measures such as content security policies that limit cross-origin resource access and regularly monitor browser updates for security patches. network security teams should be aware of potential exploitation attempts targeting this vulnerability and implement appropriate detection mechanisms to identify malicious web pages attempting to leverage cross-origin data leakage. the fix implemented by google addresses the core issue through enhanced validation of origin boundaries within the autofill subsystem, ensuring that user data remains properly isolated between different domains as required by web security standards and best practices. organizations should also review their overall browser security configurations and consider implementing additional layers of protection such as browser hardening measures and user education regarding safe browsing practices to minimize exposure to similar vulnerabilities.