EUVD-2026-56403
GHSA-c58h-6mh7-cx9v
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack (AV:L) confirmed by description; AC:H reflects race-condition UAF exploitation; PR:L per authorized-attacker prerequisite; no scope change beyond the host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Capability Access Management Service (camsvc) allows a local authenticated attacker to gain SYSTEM-level access via a use-after-free (UAF) memory corruption flaw. The vulnerability spans a wide surface including Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 23H2 through 26H1), and Windows Server 2019, 2022, and 2025, covering both standard and Server Core installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing low-privileged authenticated local session on the target Windows host - consistent with CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 is grounded in a local attack vector (AV:L), high attack complexity (AC:H), and low-privilege prerequisite (PR:L), yielding full high-impact scores across confidentiality, integrity, and availability. … 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-released security updates via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog to reach the following patched builds: Windows 10 17763.9115, 19044.7663, or 19045.7663 depending on version; Windows 11 22631.7517, 26100.9168, 26200.9168, or 28000.2704 depending on version; Windows Server 2019 build 17763.9115; Windows Server 2022 build 20348.5499; and Windows Server 2025 build 26100.33296. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 23H2 through 26H1), and Windows Server (2019, 2022, 2025) installations and prioritize shared or multi-user systems for remediation. …
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External POC / Exploit Code
Leaving vuln.today