EUVD-2026-43847
GHSA-3p26-p878-mh93
Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Local link-following EoP needs an authenticated low-priv user (PR:L) and a privileged backup action to trigger it (UI:R); full C/I/A as it yields SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows Server Backup allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Server Backup (WBADMIN component shipped with Windows 10 21H2/22H2 and Windows 11 24H2/25H2/26H1) lets an authorized, low-privileged user abuse a symbolic-link/junction race so that a backup operation acts on an attacker-chosen path, yielding SYSTEM-level access. Microsoft has released a patch and reported the flaw itself; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local, authenticated access as a low-privileged user (PR:L) on an affected Windows 10 21H2/22H2 or Windows 11 24H2/25H2/26H1 host, plus the ability to create an NTFS symbolic link, junction, or hard link that the Windows Server Backup component will resolve. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H yields 7.3 (High): the attack is local (AV:L), needs only low complexity (AC:L) and low privileges (PR:L), but is gated by required user interaction (UI:R), with full C/I/A impact and no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged local user plants a malicious junction or symbolic link in a directory that a privileged Windows Backup operation will touch, then waits for or induces that backup action to run. When the elevated backup service follows the link, it writes to or overwrites an attacker-chosen protected location, letting the attacker gain SYSTEM privileges. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft cumulative update that addresses CVE-2026-50364 for your specific Windows 10/11 servicing branch, using the KB listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50364 (exact fixed build not restated in the provided data - pull it from the MSRC page per branch). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows 10 (21H2/22H2) and Windows 11 (24H2/25H2/26H1) systems and identify those with backup operations. …
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External POC / Exploit Code
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