CVE-2026-17876 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Payments 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 cross-origin data leakage issue within the payment handling components of google chrome browser versions prior to 1510792272. The flaw stems from inadequate implementation controls that fail to properly enforce cross-origin restrictions when processing payment-related html content. Attackers can exploit this weakness by constructing malicious html pages that trigger unintended data exposure across different origins. The vulnerability falls under the category of improper access control mechanisms and specifically impacts the browser's payment subsystem where sensitive transactional information might be inadvertently accessible to unauthorized domains. This type of flaw typically arises when the browser fails to maintain proper isolation between different security contexts, allowing data from one origin to leak into another. The medium severity classification indicates that while the vulnerability does not enable complete system compromise, it provides attackers with sufficient access to extract potentially sensitive payment information or user data from cross-origin environments. The issue is particularly concerning in payment scenarios where users might be browsing sites that attempt to access payment data from other domains without proper authorization.
The technical implementation flaw manifests in how chrome handles payment processing requests when embedded within cross-origin contexts. When a crafted html page attempts to interact with payment components, the browser's security boundaries are insufficiently enforced, allowing unauthorized data retrieval. This behavior violates fundamental web security principles that require strict isolation between different origins, particularly in sensitive areas like payment handling where privacy and data protection are paramount. The vulnerability essentially creates a pathway for attackers to bypass normal cross-origin restrictions that should prevent one website from accessing another website's data without proper authorization. This type of implementation error commonly relates to issues in the browser's security model where origin-based access controls are not properly enforced during payment processing operations.
The operational impact of this vulnerability extends beyond simple data leakage to potentially compromise user privacy and financial security across multiple websites. Attackers can leverage this weakness to collect payment information, transaction details, or other sensitive user data from legitimate payment pages while users navigate to malicious sites. The cross-origin nature of the attack means that victims might not be immediately aware of the data exposure since they are typically interacting with seemingly legitimate payment interfaces. This vulnerability particularly affects e-commerce environments where users frequently engage with payment processing systems and where the integrity of payment data is critical for both user trust and regulatory compliance. The potential for financial loss increases when attackers can gather payment details from multiple sites through a single malicious payload.
Mitigation strategies should prioritize updating to chrome version 1510792272 or later where the vulnerability has been addressed through proper enforcement of cross-origin restrictions in payment handling components. Organizations should implement additional network-level protections such as content security policies that limit cross-origin resource access and monitor for suspicious payment-related requests. Browser administrators should also consider implementing strict origin-based access controls and regularly audit payment processing flows for potential cross-origin leakage vulnerabilities. Security teams should conduct thorough penetration testing of payment interfaces to identify similar implementation flaws in custom web applications. This vulnerability highlights the importance of maintaining up-to-date browser versions and implementing defense-in-depth strategies that include multiple layers of protection around sensitive data handling operations. The fix typically involves strengthening the browser's security model to ensure proper isolation between origins during payment processing, aligning with security standards such as those outlined in cwe 284 for improper access control and attack patterns related to cross-origin resource sharing violations.