CVE-2026-57977 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 pervasive and dangerous classes of web application security flaws that have plagued software systems for decades. This particular vulnerability exists within Microsoft Edge browsers that utilize the Chromium rendering engine, specifically in how the browser processes and generates web pages from user-supplied input. The flaw stems from inadequate sanitization and validation mechanisms during the dynamic generation of web content, where malicious inputs are not properly escaped or filtered before being incorporated into the document object model. Such deficiencies create opportunities for attackers to inject malicious scripts that execute within the context of the victim's browser session, effectively bypassing traditional security boundaries.
The technical nature of this vulnerability aligns with CWE-79 which defines cross-site scripting as a condition where an application incorporates untrusted data into web pages without proper validation or escaping. In Microsoft Edge's case, when processing web content that includes user-controlled input during page generation, the browser fails to adequately neutralize potentially dangerous characters and sequences that could be interpreted as executable code by the JavaScript engine. This weakness enables attackers to craft malicious payloads that exploit the browser's rendering pipeline, allowing them to inject script tags, event handlers, or other dangerous constructs into web pages. The vulnerability specifically manifests when the browser encounters input that should be treated as literal text but instead gets processed as executable instructions, creating a pathway for unauthorized code execution.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it provides attackers with sophisticated capabilities for network-based spoofing operations. An attacker can leverage this flaw to manipulate the browser's display of content, potentially redirecting users to malicious sites, stealing cookies and session tokens, or even modifying page elements to deceive users into divulging sensitive information. The Chromium-based architecture of Microsoft Edge means that this vulnerability affects a broad user base since millions of devices rely on this rendering engine for web browsing operations. When exploited successfully, the attack can be executed through various vectors including malicious websites, compromised advertisements, or phishing campaigns that specifically target the vulnerable browser versions.
Mitigation strategies for this type of vulnerability must address both immediate defensive measures and long-term architectural improvements to prevent similar issues from recurring. Organizations should implement comprehensive input validation and output encoding mechanisms at multiple layers of their web applications, ensuring that all user-supplied data undergoes proper sanitization before being incorporated into dynamic content. The implementation of Content Security Policy headers provides an additional layer of protection by restricting the sources from which scripts can be loaded, effectively limiting the damage that malicious code can cause even if it manages to bypass primary defenses. Regular security updates and patch management protocols become critical when addressing browser-based vulnerabilities, as the remediation often requires coordinated efforts between vendors and users to ensure complete protection across all affected versions of the software. This vulnerability also highlights the importance of adhering to secure coding practices and following established frameworks such as the OWASP Top Ten and ATT&CK matrix guidelines for preventing web application security flaws that could enable similar attack vectors.