Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing low-privilege local account to reach the Spooler (AV:L, PR:L), no interaction, and successful heap corruption yields SYSTEM with full C/I/A impact.
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
Heap-based buffer overflow in Windows Print Spooler Components allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Print Spooler Components affects Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019/2022/2025, where a heap-based buffer overflow (CWE-122) lets an already-authenticated local user corrupt heap memory in a Spooler component and gain SYSTEM-level privileges. Exploitation requires low-privilege local access (CVSS AV:L/PR:L) with no user interaction, yielding full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have valid low-privilege local access to the target (CVSS PR:L, AV:L) and the Windows Print Spooler service to be present and running, which it is by default on client SKUs and print servers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (High) reflects a local attack vector (AV:L), low complexity (AC:L), low privileges required (PR:L), no user interaction (UI:N), unchanged scope, and high impact across confidentiality, integrity, and availability - a classic reliable local-EoP profile once an attacker already has a foothold. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privilege foothold on a Windows host - for example via phishing, a compromised service account, or stolen user credentials - invokes the vulnerable Print Spooler component with crafted input that overflows a heap buffer, corrupting adjacent memory to redirect execution inside the SYSTEM-context Spooler process. The result is escalation from a standard user to SYSTEM, enabling installation of tools, credential theft, and lateral movement. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50499 as described in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50499 (Patch available per vendor advisory); the exact fixed KB build varies by OS SKU and must be taken from that Update Guide entry rather than a single global version number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server 2019, 2022, or 2025 to identify patch scope. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44101
GHSA-q67p-8xjr-9rwq