EUVD-2026-56443
GHSA-pgvw-9c6v-jpf7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local exploitation by a standard user with no interaction; full C/I/A impact reflects attainable SYSTEM-level privilege escalation with no scope change.
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
3DescriptionCVE.org
Heap-based buffer overflow in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Desktop Window Manager (dwm.exe) enables a locally authenticated low-privileged user to escalate to SYSTEM-level privileges. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms exploitation requires only existing local access with standard user credentials and no user interaction, making this a viable second-stage privilege escalation tool post-initial-compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold local authenticated access with at least standard user (low-privilege) credentials on the target Windows system - confirmed by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects the risk profile: local, low-complexity exploitation by a standard user yielding full confidentiality, integrity, and availability impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update published via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65787. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems and identify those running vulnerable dwm.exe versions; prioritize servers and workstations handling sensitive data. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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