EUVD-2026-44107
GHSA-fwc5-hhf3-xf48
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local elevation by an authenticated low-priv user (AV:L/PR:L), high complexity from the race/memory-layout dependence typical of OOB-read EoP (AC:H), full host impact (C/I/A:H, S:U).
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Out-of-bounds read in Code Integrity DLL (ci.dll) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Code Integrity module (ci.dll) lets an already-authenticated low-privileged attacker read out-of-bounds memory (CWE-125) and leverage the resulting condition to gain higher privileges on affected Windows 10, Windows 11, and Windows Server systems back to Server 2012. The CVSS 3.1 score is 7.0 (High) with a local vector and high attack complexity, and there is no public exploit 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 low-privileged code execution on the target Windows system (AV:L, PR:L) - this is a post-compromise or malicious-insider escalation, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a moderate-priority, defense-in-depth patch rather than an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local attacker who already has a low-privileged foothold - for example a standard user on a shared terminal server or an unprivileged process from a prior compromise - supplies crafted signature or code-integrity data that triggers the out-of-bounds read in ci.dll and manipulates the resulting condition to execute code at higher privilege. The high attack complexity (AC:H) means the attacker likely must win a race or control memory layout, so success is not guaranteed on the first attempt, and no public exploit identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-50491 as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50491 (Patch available per vendor advisory); consult the MSRC update guide for the exact patched build/KB matching each Windows 10/11 or Windows Server release, since the advisory lists per-product build numbers rather than a single version string. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Windows 10, 11, and Windows Server 2012+ systems in your environment and validate patch availability through MSRC update guidance. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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