CVE-2026-58299 in Edge
Summary
by MITRE • 07/04/2026
Time-of-check time-of-use (toctou) race condition in Microsoft Edge for Android allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 07/04/2026
A time-of-check time-of-use race condition vulnerability exists in Microsoft Edge for Android that creates a critical security gap allowing remote code execution by unauthorized attackers. This flaw occurs when the browser performs a check operation at one point in time and then uses the result at a later point, creating a window where malicious actors can manipulate the system state between these two operations. The vulnerability specifically affects the Android implementation of Microsoft Edge and represents a classic race condition scenario where timing dependencies create exploitable conditions.
The technical implementation of this race condition involves the browser's handling of resource access and validation processes within its rendering engine. When Edge performs checks on file or memory operations, there exists a temporal gap between when the system validates permissions or states and when it actually executes the corresponding actions. During this window, an attacker can manipulate the underlying resources to cause the application to execute unintended code paths. This type of vulnerability falls under CWE-367 which specifically addresses time-of-check to time-of-use flaws in software systems.
From an operational perspective, this vulnerability poses significant risk to Android users who rely on Microsoft Edge as their primary browser for accessing web content. The remote execution capability means attackers can exploit this flaw without requiring physical access to devices or local network presence. Attackers can craft malicious web pages or manipulate existing websites to trigger the race condition, potentially leading to full system compromise. The Android platform's security model becomes vulnerable when such conditions exist within browser applications that have extensive permissions and access to system resources.
The impact extends beyond simple code execution as this vulnerability could enable attackers to escalate privileges, access sensitive user data, or establish persistent backdoors on affected devices. The exploitation requires network-based attacks that can be delivered through compromised websites, phishing campaigns, or malicious advertisements. This represents a serious concern for enterprise environments where mobile device security is paramount and user browsing activities may expose corporate networks to additional threats.
Mitigation strategies should include immediate patching of Microsoft Edge applications through official update channels, enabling automatic security updates where possible, and implementing network-based protections such as web application firewalls. Organizations should consider temporary restrictions on browser functionality or deployment of alternative secure browsers until patches are fully deployed. Security monitoring should focus on detecting anomalous network traffic patterns that might indicate exploitation attempts. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and code injection techniques, emphasizing the need for layered defensive measures including application whitelisting, sandboxing, and regular security assessments of mobile browser implementations.