Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privilege session (AV:L, PR:L), no user interaction and low complexity (UI:N, AC:L), yielding full SYSTEM-level C/I/A impact on the host.
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
Integer overflow or wraparound in Windows Web Proxy Auto-Discovery Protocol (WPAD) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Web Proxy Auto-Discovery Protocol (WPAD) component lets an already-authenticated local user run code with SYSTEM-level rights by triggering an integer overflow (CWE-190). The flaw affects a broad range of Windows client and server builds, from Windows 10 1809 through Windows 11 26H1 and Windows Server 2019 through 2025. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have a valid low-privilege local session on the target Windows machine (CVSS PR:L, AV:L) and the ability to reach the WPAD/proxy auto-discovery code path, which is present by default across the affected Windows client and server builds. … 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/C:H/I:H/A:H, base 7.8) describes a locally-exploitable, low-complexity flaw requiring low existing privileges and no user interaction, yielding full confidentiality, integrity, and availability impact on the local host - the classic profile of a privilege-escalation primitive rather than a remote entry point. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged foothold on a Windows host - for example via a phished user account or a compromised low-rights service - invokes the WPAD code path with crafted input that triggers the integer overflow, corrupting memory in a privileged context and escalating to SYSTEM. With AV:L/AC:L/PR:L/UI:N the escalation is reliable, requires no victim interaction, and needs only local access. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49800 via Windows Update or WSUS; the vendor-released patch is available and the exact fixed KB/build for each affected SKU is listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49800. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all affected Windows systems: Windows 10 (1809 and later), all versions of Windows 11, and Windows Server 2019 through 2025. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1809
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local privilege escalation in the Windows Kernel lets an already-authenticated attacker corrupt kernel memory via a use-
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43815
GHSA-pp8g-rw5h-xf5x