CVE-2026-20811Patch(microsoft / windows_11_23h2)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_11_23h2 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

1.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-822CWE-843

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • windows_11_23h2
  • windows_11_24h2
  • windows_11_25h2
  • windows_server_2022

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
Products
windows_11_23h2windows_11_24h2windows_11_25h2windows_server_2022windows_server_2022_23h2windows_server_2025

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-03-29: 1Patch / Workaround · 2026-03-29: 1Technical Details · 2026-03-29: 103-29
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Adrián Díaz@s4dbrd
    Patch

    Wrote up my first Patch Tuesday diff. CVE-2026-20811, type confusion in win32kfull.sys. CMonitorTopology* survives incomplete sanitization in the async path. Feedback welcome! https://s4dbrd.github.io/posts/win32k-type-confusion-async-window-action-cmonitor/

    Post summary

    The post is a Patch Tuesday write‑up detailing the CVE‑2026‑20811 type confusion vulnerability and noting the availability of a patch for it.

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    596 followersView on X
CPE platform detail6 entries

6 of 6 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_11_23h2---
OSmicrosoftwindows_11_24h2---
OSmicrosoftwindows_11_25h2---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2022_23h2---
OSmicrosoftwindows_server_2025---

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