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CVE-2026-44803Disclosure(microsoft / excel)

MEDIUMCVSS 7.8 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Prioritize remediation for microsoft excel systems immediately
  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.

microsoft CVEsBack to dashboard
4.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-190

Priority

MEDIUM

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

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

  • excel
  • powerpoint
  • windows_10_1607
  • windows_10_1809

Threat summary

  • Public PoC and exploit tooling are both present
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Exploit tool or code specified in 1 signal
  • PoC mentioned or linked in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-06-10); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
microsoft
Products
excelpowerpointwindows_10_1607windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1

2 versions affected across 16 products

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-10: 1Mentions · 2026-07-12: 1PoC Mentioned / Linked · 2026-07-12: 1Exploit Tool / Code · 2026-07-12: 1Technical Details · 2026-06-10: 1Technical Details · 2026-07-12: 106-1007-12
Signal classification2 categories
Disclosure
150.0%
PoC
150.0%
Referenced assets1 URL
By indicator
Classification over time
DateTotalLabels
2026-06-101
Disclosure1
2026-07-121
PoC1
Full discourse2 posts
  • Cyber Advising@cyber_advising
    PoC

    CVE-2026-44803: Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally. PoC https://github.com/omair2084/misc/blob/master/D3DKMT.ps1 https://t.co/FBhvo4JjIY

    Post summary

    A proof‑of‑concept PowerShell script demonstrates local code execution via CVE‑2026‑44803, an integer overflow in Windows Win32K (GRFX). No active exploitation or patch information is referenced.

    09063344.8K
    13.6K followersView on X
  • kawn@kawn2020
    Disclosure

    #windowsupdate #microsoft つづき ・CVE-2026-42985　8.8　リモート デスクトップ クライアント ・CVE-2026-42986　7.8　Microsoft Graphics コンポーネント ・CVE-2026-42989　7.8　Winlogon ・CVE-2026-44803　7.8　Windows Win32K: GRFX ・CVE-2026-44812　7.8　Windows Win32K: GRFX つづく…

    Post summary

    The tweet merely enumerates several Windows 2026 CVEs with their CVSS scores and affected components, serving as a disclosure without mentioning PoCs, exploits, active use, patches, or debunking.

    1001087
    85 followersView on X
CPE platform detail27 entries

27 of 27 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoftexcel-android-
Appmicrosoftpowerpoint-android-
OSmicrosoftwindows_10_1607--x64
OSmicrosoftwindows_10_1607--x86
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_2012---
OSmicrosoftwindows_server_2012r2--
OSmicrosoftwindows_server_2016--x64
OSmicrosoftwindows_server_2019--x64
OSmicrosoftwindows_server_2022--x64
OSmicrosoftwindows_server_2025--x64
Appmicrosoftword-android-

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