CVE-2026-58635 in Windows
Summary
by MITRE • 07/14/2026
Improper neutralization of special elements used in a command ('command injection') in Windows Narrator Braille allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
Command injection vulnerabilities occur when untrusted data is incorporated into system commands without proper sanitization or validation, creating opportunities for malicious execution. In the context of Windows Narrator Braille, this vulnerability represents a critical security flaw that enables authenticated attackers to exploit command injection pathways within the accessibility service. The flaw specifically manifests in how the braille output processing component handles special elements during command execution, allowing an attacker with local access to manipulate input parameters that are subsequently processed as system commands. This type of vulnerability falls under the Common Weakness Enumeration category CWE-77, which specifically addresses improper neutralization of special elements used in a command.
The technical implementation of this vulnerability involves the braille rendering engine's insufficient validation of input data when processing textual content for braille display output. When Narrator processes text that contains special characters or sequences, these elements are not properly sanitized before being passed to underlying system commands or APIs. An attacker can craft malicious input that, when processed by the braille service, results in unintended command execution with elevated privileges. The privilege escalation occurs because the Narrator service typically runs with higher privileges than standard user accounts, allowing the injected commands to execute with the same elevated permissions.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with a persistent foothold within the Windows environment through the accessibility service. Since Narrator is designed to run continuously in the background and provide accessibility features for users, an attacker can leverage this persistent service to maintain access without requiring additional attack vectors. The vulnerability affects systems where Narrator is enabled and accessible to local users, making it particularly dangerous in enterprise environments where accessibility features are commonly enabled. Attackers can exploit this weakness to execute arbitrary code, modify system configurations, or establish backdoors within the operating system.
Mitigation strategies for this command injection vulnerability focus on implementing proper input validation and sanitization mechanisms within the Narrator Braille component. System administrators should ensure that all user inputs are properly escaped or encoded before being processed by any command execution pathways. The recommended approach involves applying the principle of least privilege to accessibility services, limiting their execution permissions and restricting access to only necessary system resources. Additionally, implementing application whitelisting controls and monitoring for unusual command execution patterns can help detect potential exploitation attempts. Organizations should also consider disabling unnecessary accessibility features when they are not actively required, reducing the attack surface available to potential attackers. This vulnerability demonstrates the importance of securing accessibility services which often run with elevated privileges and provide continuous access to system resources, aligning with ATT&CK technique T1059.001 for command and scripting interpreter usage and T1068 for exploit for privilege escalation.