CVE-2025-53791 in Edge
Summary
by MITRE • 09/06/2025
Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.
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Analysis
by VulDB Data Team • 09/19/2025
CVE-2025-53791 represents a critical access control vulnerability within Microsoft Edge browser that stems from improper implementation of security boundaries in the chromium-based rendering engine. This flaw manifests as a failure in the browser's permission system where network-based attackers can exploit a weakness in the access control mechanisms to bypass security features that should normally restrict unauthorized access to protected resources. The vulnerability specifically affects the browser's handling of network requests and could potentially allow attackers to access content or functionality that should be restricted to authenticated users or specific contexts. This issue falls under the CWE-284 category of improper access control, which is a fundamental security weakness that enables unauthorized access to resources or capabilities. The vulnerability's network-based exploitation vector means that attackers do not need physical access to the target system, making it particularly dangerous in enterprise environments where network exposure is common. According to ATT&CK framework, this vulnerability maps to T1071.004 which covers application layer protocols and T1566 which covers credential access through network-based attacks.
The technical implementation of this access control flaw likely involves a misconfiguration in the browser's security sandbox or a failure in the origin-based access control policies that normally prevent cross-origin resource sharing violations. Microsoft Edge's chromium-based architecture includes multiple security layers including the site isolation feature and strict origin policies that should prevent unauthorized access to resources across different domains or contexts. However, this vulnerability demonstrates a gap in how the browser handles specific network request scenarios where access control checks are either bypassed or improperly validated. The flaw may be related to how the browser evaluates permissions for network resources, particularly when dealing with complex web applications that make multiple cross-origin requests. Attackers could potentially leverage this vulnerability to access sensitive data or functionality that should be protected by the browser's security model.
The operational impact of CVE-2025-53791 extends beyond simple unauthorized access as it represents a fundamental weakening of the browser's security posture that could enable more sophisticated attacks. In enterprise environments where Microsoft Edge is widely deployed, this vulnerability could allow attackers to escalate privileges or access sensitive corporate data through web-based attacks. The vulnerability's network-based nature means that it could be exploited through phishing campaigns, malicious websites, or compromised web applications that target the specific access control bypass mechanism. Organizations running Microsoft Edge in production environments face increased risk of data breaches or privilege escalation attacks that could compromise entire user sessions or access control boundaries within the browser. The vulnerability could also enable attackers to bypass security features that protect against cross-site scripting attacks or other browser-based threats, creating a cascading effect on overall security.
Mitigation strategies for CVE-2025-53791 should focus on immediate patch deployment as the primary defense mechanism, with organizations monitoring Microsoft's security advisories for the official fix. Network administrators should implement additional monitoring of browser network traffic to detect anomalous access patterns that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date browser security configurations and implementing additional security layers such as web application firewalls or content security policies that can provide additional protection against exploitation attempts. Security teams should also consider implementing browser hardening measures that restrict unnecessary permissions and capabilities that could be exploited through this access control bypass. Organizations should conduct security assessments to identify systems running vulnerable versions of Microsoft Edge and prioritize patching based on risk exposure. The incident underscores the critical importance of regular security updates and the need for organizations to maintain comprehensive patch management processes that can quickly respond to vulnerabilities in widely-used browser applications.