CVE-2026-17880 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 critical cross-origin data leakage issue within Google Chrome's Autofill implementation that existed prior to version 151.0.7922.72. The flaw stems from inadequate input validation and sanitization mechanisms within the browser's autofill system, which processes user data across different origins without proper security boundaries. When a malicious actor crafts a specially designed HTML page, the vulnerable Autofill component fails to properly isolate data from different security contexts, creating an avenue for unauthorized information disclosure.
The technical implementation flaw manifests in how Chrome handles cross-origin requests within its autofill subsystem. When users navigate to malicious websites that contain crafted HTML elements, the browser's autofill mechanism inadvertently exposes sensitive data from other origins. This occurs because the system does not adequately verify the security context of incoming data or properly enforce same-origin policies during the autofill process. The vulnerability specifically affects how Chrome stores and retrieves user credentials, form data, and other personal information across different domains, bypassing expected security boundaries that should prevent such cross-domain data leakage.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables sophisticated attack vectors that can compromise user privacy and potentially lead to credential theft. Attackers can leverage this flaw to gather sensitive information from users' browsers without their knowledge or consent, particularly targeting users with multiple accounts across different domains. The medium severity classification reflects the potential for significant data exposure while acknowledging that exploitation typically requires specific conditions involving crafted web content. This vulnerability aligns with CWE-200, which addresses "Information Exposure" and represents a failure to properly restrict information flow between different security contexts.
Security researchers have identified this issue as part of broader concerns regarding browser sandboxing and cross-origin resource management. The vulnerability demonstrates weaknesses in Chromium's security model where the autofill service operates with insufficient isolation from other browser components. This flaw can be exploited through techniques that abuse the browser's form filling capabilities, potentially allowing attackers to harvest login credentials, personal information, or other sensitive data from users' browsers. Organizations implementing security controls should consider this vulnerability when assessing their browser security posture and user protection measures.
Mitigation strategies for this vulnerability focus on immediate patching of affected Chrome versions along with enhanced monitoring of browser behavior and network traffic patterns. System administrators should ensure all Chrome installations are updated to version 151.0.7922.72 or later, as this release contains the necessary security fixes that properly isolate cross-origin data within the Autofill subsystem. Additional protective measures include implementing content security policies that restrict cross-origin resource loading, deploying web application firewalls that can detect and block malicious HTML content, and conducting regular security audits of browser configurations. The fix addresses the underlying implementation gap by enforcing stricter origin validation and data isolation within the autofill service, preventing unauthorized access to user information across different domains.
This vulnerability also highlights the importance of maintaining up-to-date browser security implementations as part of broader cybersecurity frameworks. Organizations should establish automated patch management processes specifically targeting browser software updates, given that web-based vulnerabilities like this can be exploited remotely without user interaction. The remediation process involves not only updating Chrome but also ensuring that other browser components and extensions do not create additional attack vectors within the same security domain. Security teams should monitor for similar implementation flaws in other browser features and consider implementing browser hardening measures that reduce the attack surface for cross-origin data leakage scenarios.