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.

Affected

Microsoft · Windows Server 2012 R2 · Windows Server 2012 R2 (Server Core installation) · Windows Server 2016 · Windows Server 2016 (Server Core installation) · Windows Server 2019 · Windows Server 2019 (Server Core installation)

CVSS v3.1 MICROSOFT

8.0 HIGHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.54% chance of exploitation in the next 30 days, 44th percentile

Published

2026-04-14

Updated

2026-10-15

Proof-of-concept exploits (1)

• kaleth4/CVE-2026-338261★ · 2026-04-22

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826

References

• CVE Record
• NVD entry

Related

• CVE-2014-6271
• CVE-2019-7711
• CVE-2021-44228
• CVE-2022-30190
• CVE-2024-6387
• CVE-2024-6409