CVE-2026-33826
Windows Active Directory Remote Code Execution Vulnerability
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Active Directory Remote Code Execution Vulnerability
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
- Record
CVE-2026-33826- CVSS 3.1
- 8.0 High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2026-22645
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
- Record
EUVD-2026-22645- CVSS 3.1
- 8.0 High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-495g-jr6v-pch8
Improper input validation in Windows Active Directory allows an authorized attacker to execute...
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
- Record
GHSA-495g-jr6v-pch8- CVSS 3.1
- 8.0 High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
NVD
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
- Record
CVE-2026-33826- CVSS 3.1
- 8.0 High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
- microsoft windows server 2012 r2
- microsoft windows server 2012 r2 (server core installation)
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows server 2012
- microsoft windows server 2022 23h2
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | kaleth4/CVE-2026-33826 | 2026-04-22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-33826 is a high vulnerability (CVSS 8.0) in Microsoft Windows Server 2012 R2, published April 14, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.53%, the 45th percentile. No source names a fixed version.