Microsoft Defender
CVE-2026-33825 — Microsoft Defender Elevation of Privilege Vulnerability
Executive Summary
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
0.06749
probability of exploitation in the next 30 days
0.93365 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
1 affected product
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Defender Antimalware Platform | Release Notes (Security Update) |
Important | Elevation of Privilege | Maybe |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
Exploits & PoC
5 public PoCsUnverified third-party code
Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.
| Repository | Stars | Published | Description |
|---|---|---|---|
| Letlaka/redsun-bluehammer-undefend-detection-pack | 8 | 2026-04-17 | Microsoft Defender XDR KQL detections for RedSun, BlueHammer, UnDefend, and CVE-2026-33825-related Defender abuse behaviors. |
| 0xBlackash/CVE-2026-33825 | 5 | 2026-05-18 | CVE-2026-33825 |
| Joe1sn/CVE-2026-33825 | 4 | 2026-05-02 | RedSun PoC for self use |
| Bilal3755/Detecting_blue_hammer_vuln | 0 | 2026-04-20 | Threat hunting query for bluehammer CVE windows CVE-2026-33825 |
| kaleth4/CVE-2026-33825 | 0 | 2026-04-22 |
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
Yuanpei XU (HUST) with Diffract & 0x25028335 & 0xa773900
Zen Dodd
References
On This Page