CVE-2026-58524 in Edge
Summary
by MITRE • 07/04/2026
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.
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Analysis
by VulDB Data Team • 07/04/2026
Cross-site scripting vulnerabilities represent one of the most prevalent and dangerous classes of web application security flaws, with the specific weakness in Microsoft Edge Chromium-based browsers demonstrating how even major browser vendors can introduce exploitable conditions through insufficient input sanitization during web page generation processes. This particular vulnerability stems from the improper neutralization of user-supplied input when rendering web content, creating an environment where malicious actors can inject arbitrary script code that executes within the context of other users' browsing sessions. The flaw specifically manifests during the web page generation phase where the browser fails to adequately sanitize or escape potentially malicious input before incorporating it into dynamically generated HTML content, allowing attackers to craft payloads that bypass standard security mechanisms.
The technical implementation of this vulnerability aligns with CWE-79 which categorizes cross-site scripting as a weakness involving the improper handling of untrusted data within web applications. When an attacker successfully exploits this condition, they can inject malicious scripts that execute in the victim's browser context, potentially enabling session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The attack vector typically involves delivering malicious input through web forms, URL parameters, or API endpoints that are subsequently rendered in web pages without proper sanitization. In Microsoft Edge Chromium-based environments, this weakness creates a persistent threat where network-based attackers can leverage the browser's rendering engine to execute arbitrary code, potentially compromising user sessions and data integrity.
The operational impact of this vulnerability extends beyond simple script execution, as it fundamentally undermines the security model that browsers implement to protect users from malicious content. Attackers can craft sophisticated phishing campaigns that appear legitimate while executing malicious code, perform session fixation attacks, or redirect users to malicious domains. The network-based nature of the exploitation means that attackers do not require physical access to victim systems or complex local attack vectors, making this vulnerability particularly dangerous in enterprise environments where users frequently interact with web applications containing user-generated content. This weakness directly maps to several ATT&CK techniques including T1566 for phishing and T1059 for command and scripting interpreter usage, demonstrating how the vulnerability can be leveraged as part of broader attack chains.
Mitigation strategies for this type of vulnerability involve implementing comprehensive input validation and output encoding mechanisms throughout the application stack. Organizations should deploy Content Security Policy headers to restrict script execution contexts and implement proper input sanitization at all entry points where user data is processed. Browser vendors like Microsoft must ensure rigorous code review processes and automated testing that includes fuzzing and security scanning to identify potential injection vectors during development cycles. Additionally, regular security updates and patch management procedures are essential for addressing such vulnerabilities promptly. The remediation approach should focus on both preventing the injection of malicious content and ensuring that any potentially dangerous input is properly escaped or encoded before being incorporated into web page generation processes. Security teams should also implement monitoring solutions to detect anomalous user behavior patterns that might indicate exploitation attempts, while maintaining awareness of emerging attack techniques targeting similar vulnerabilities in web browsers and applications.