EUVD-2026-43806
GHSA-6v4x-m393-5vg2
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Local attacker with an existing low-priv account (AV:L/PR:L), no interaction, link-following yields integrity/availability compromise but no data disclosure (C:N/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Routing and Remote Access Service (RRAS) allows an already-authenticated low-privileged user to abuse a link-following (symlink/junction) flaw to gain higher privileges on the host. The bug affects a broad range of client and server SKUs from Windows Server 2012 through Windows Server 2025 and Windows 10 1607 through Windows 11 26H1, and Microsoft has shipped a fix. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have a local, authenticated low-privileged account on the target (CVSS PR:L, AV:L) and requires the Routing and Remote Access Service to be present and running - a non-default role most commonly enabled on VPN/NAT/routing servers rather than typical desktops. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H, base 7.1) describes a local, low-complexity attack requiring existing low-level privileges and no user interaction, with high integrity and availability impact but no confidentiality impact - consistent with a privilege-escalation primitive rather than data theft, despite the input's 'Information Disclosure' tag which appears mislabeled given C:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a standard, non-admin account on a Windows server running RRAS plants a symbolic link or NTFS junction in a location the service touches, then triggers the privileged RRAS file operation so it follows the link and acts on a protected target. This lets them corrupt or overwrite a system file to execute code or overwrite data as the service account, escalating from limited user to high privilege; the local, low-complexity vector makes exploitation reliable once a foothold exists, though no public POC is currently identified. |
| Remediation | Apply the Microsoft security update for CVE-2026-49791 for the affected SKU - patch available per vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49791); consult that page for the exact patched build/KB per operating system version, as Microsoft did not publish a single fixed version string here. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows Server 2012-2025 and Windows 10 version 1607 through Windows 11 version 26H1 to determine organizational exposure and identify RRAS-enabled systems. …
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Same weakness CWE-59 – Improper Link Resolution Before File Access
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External POC / Exploit Code
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