EUVD-2026-43776
GHSA-ccg6-g66f-f9mv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L) triggers a low-complexity injection needing no interaction, yielding full SYSTEM-level compromise, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Improper neutralization of special elements used in a command ('command injection') in Windows Narrator Braille allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Narrator (the built-in screen reader) arises from improper neutralization of special elements in its Braille support component, allowing an already-authenticated local attacker (PR:L) to inject and execute OS commands that run with elevated privileges. All supported Windows client and server builds from Windows 10 1809 through Windows 11 26H1 and Windows Server 2019-2025 are affected, and Microsoft has released a patch. There is no public exploit identified at time of analysis and the CVE is not in CISA KEV, so exploitation is not confirmed as active.
Technical ContextAI
The flaw is a CWE-77 command injection within the Braille handling logic of Windows Narrator, the accessibility screen reader shipped in-box with Windows. Because Narrator and its Braille display driver interactions run with higher integrity to service assistive-technology functions, unsanitized special characters passed through the Braille feature can be interpreted as command separators/operators and executed by an underlying shell or process, giving the caller code execution above their original privilege level. The CPE set (cpe:2.3:a:microsoft:windows_10_version_1809 through windows_11_version_26h1, plus windows_server_2019/2022/2025 including Server Core) shows this is inherent to the accessibility stack across the entire supported OS line, not a third-party add-on.
RemediationAI
Apply the Microsoft security update for CVE-2026-58635 - Patch available per vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58635); the exact fixed build number is not specified in the provided data and should be taken from that advisory for each affected OS version. Because exploitation depends on the Windows Narrator Braille feature, an interim compensating control on systems where accessibility tools are not required is to avoid launching Narrator/Braille support and restrict which non-administrative users can log in interactively, since this is a local escalation that requires an existing account; note the trade-off that disabling or not using Narrator removes screen-reader accessibility for users who rely on it. Prioritize multi-user hosts, RDP/terminal servers, and shared workstations where untrusted low-privilege users have local access.
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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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