EUVD-2026-43935
GHSA-mq63-hg3r-h2qp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and standard-user prerequisite give AV:L/PR:L; no interaction and a straightforward authorization bypass give UI:N/AC:L; escalation to SYSTEM yields full C:H/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:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper authorization in Windows OLE allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows OLE (Object Linking and Embedding) component allows an already-authenticated, low-privileged user on affected Windows and Windows Server builds to elevate to higher privileges through an improper authorization check (CWE-285). Microsoft has released a patch, and no public exploit has been identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access to the target host with at least low (standard-user) privileges (CVSS PR:L, AV:L); it is not remotely reachable and cannot be triggered across the network or by a purely unauthenticated actor. … 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) describes a local, low-complexity attack requiring low privileges and no user interaction, yielding a base score of 7.8 (High) with high impact to confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained standard-user access to a Windows host - for example through phishing, a stolen credential, or a compromised low-privileged service - invokes the flawed OLE operation to bypass its authorization check and execute code in a higher-privileged context, gaining SYSTEM-level control of the machine. Given AV:L/AC:L/PR:L/UI:N, the technique is reliable and needs no victim interaction once local access is held. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50344 for each affected build as listed in the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50344, which enumerates the exact fixed KB/build numbers per operating system (exact fixed-build strings were not included in the supplied data and should be taken from that advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows and Windows Server systems in your environment and prioritize those with shared local access or high-value data. …
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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