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CVE-2026-33839Patch(microsoft / windows_10_1809)

LOWCVSS 7.0 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_10_1809 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

microsoft CVEsBack to dashboard
1.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-362

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

  • windows_10_1809
  • windows_10_21h2
  • windows_10_22h2
  • windows_11_23h2

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-05-12); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
microsoft
Products
windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2019windows_server_2022windows_server_2022_23h2

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-12: 1Mentions · 2026-05-15: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-12: 1Technical Details · 2026-05-15: 105-1205-15
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-05-121
Patch1
2026-05-151
Disclosure1
Full discourse2 posts
  • Israel@f1tym1
    Disclosure

    CVE-2026-33839 | Microsoft Windows up to Server 2025 Win32k race condition (WID-SEC-2026-1489) https://ift.tt/1bDqz6s A vulnerability, which was classified as critical, has been found in Microsoft Windows. Affected by this issue is some unknown functionality of the component W…

    Post summary

    A critical race‑condition vulnerability (CVE-2026-33839) was disclosed affecting Microsoft Windows' Win32k component up to Server 2025, with no current exploit, patch, or active exploitation details mentioned.

    0000051
    974 followersView on X
  • WindowsForum@windowsforum
    Patch

    🪟 CVE-2026-33839 is the classic “not remote, but still SYSTEM” horror story. Win32k + race condition = local trouble with a crown. Patch now—because Windows never waits nicely. #Windows #Security https://windowsforum.com/threads/cve-2026-33839-win32k-grfx-race-condition-patch-now-to-stop-system-eop.417708/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #WindowsSecurity #PrivilegeEscalation #RaceCondition https://t.co/83rqBw2ONT

    Post summary

    The tweet highlights the Win32k race-condition CVE-2026-33839, warns of local SYSTEM privilege escalation, and urges users to apply the available patch.

    0000030
    1.1K followersView on X
CPE platform detail20 entries

20 of 20 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_10_1809--x64
OSmicrosoftwindows_10_1809--x86
OSmicrosoftwindows_10_21h2--arm64
OSmicrosoftwindows_10_21h2--x64
OSmicrosoftwindows_10_21h2--x86
OSmicrosoftwindows_10_22h2--arm64
OSmicrosoftwindows_10_22h2--x64
OSmicrosoftwindows_10_22h2--x86
OSmicrosoftwindows_11_23h2--arm64
OSmicrosoftwindows_11_23h2--x64
OSmicrosoftwindows_11_24h2--arm64
OSmicrosoftwindows_11_24h2--x64
OSmicrosoftwindows_11_25h2--arm64
OSmicrosoftwindows_11_25h2--x64
OSmicrosoftwindows_11_26h1--arm64
OSmicrosoftwindows_11_26h1--x64
OSmicrosoftwindows_server_2019---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2022_23h2---
OSmicrosoftwindows_server_2025---

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