CVE-2026-17764 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in FedCM in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability in question represents a critical flaw in the Federated Credential Management API implementation within Google Chrome browsers prior to version 151.0.7922.72. This issue falls under the category of improper access control and specifically relates to the bypassing of same origin policy restrictions that are fundamental to web security architecture. The vulnerability stems from inadequate validation mechanisms within the FedCM implementation that fails to properly enforce cross-origin restrictions when processing credential requests.
The technical flaw manifests through a crafted HTML page that exploits a gap in the origin validation logic. When Chrome processes federated credential requests, it should strictly enforce same origin policy boundaries to prevent unauthorized cross-domain access to authentication credentials. However, the vulnerable implementation allows malicious actors to craft HTML content that can manipulate the browser's credential handling behavior across different origins. This creates an attack vector where a remote attacker can potentially access or manipulate credential data from domains they should not have access to.
The operational impact of this vulnerability extends beyond simple privilege escalation as it compromises the core security model of web browsers and federated authentication systems. Attackers could leverage this flaw to perform unauthorized credential access attempts, potentially leading to account takeovers or unauthorized access to sensitive applications that rely on federated login mechanisms. The medium severity classification reflects the fact that while direct exploitation requires user interaction through a crafted webpage, the potential for abuse remains significant given the privileged nature of credential handling operations.
This vulnerability aligns with CWE-284 which addresses improper access control and specifically relates to inadequate enforcement of access restrictions in web browser implementations. From an ATT&CK framework perspective, this issue maps to privilege escalation techniques and credential access methods that attackers might employ to bypass security controls. The flaw demonstrates how seemingly minor implementation gaps in browser security features can create substantial risks when dealing with authentication systems.
Mitigation strategies should focus on immediate browser updates to version 151.0.7922.72 or later where the vulnerability has been patched. Organizations should also implement additional monitoring for suspicious credential handling patterns and ensure that their web applications properly validate origin parameters when implementing FedCM functionality. Network-level protections such as content security policies and strict origin validation can provide additional defense in depth measures. Administrators should review existing FedCM implementations and verify that proper access controls are in place to prevent unauthorized cross-origin credential access attempts.
The vulnerability highlights the importance of thorough security testing for browser APIs, particularly those dealing with authentication and credential management where improper implementation can have cascading security implications throughout the entire web ecosystem. Regular security audits of browser components and prompt patch management remain essential practices for maintaining secure web environments. Organizations should also consider implementing automated monitoring solutions that can detect anomalous credential handling behaviors that might indicate exploitation attempts against similar vulnerabilities.