CVE-2026-33825
Microsoft Defender: Insufficient Granularity of Access Control
As of , CVE-2026-33825 in Microsoft Defender is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.
- Exploited
- Yes: CISA listed it on 22 April 2026
- US federal deadline
- 6 May 202614 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- KnownCISA changed it from Unknown to Known on 29 June 2026.
- EPSS score
- 0.00Higher than 31% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: msrc.microsoft.comLinks below, from CISA's entry.
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA's required action
What the flaw is
Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.
CISA's description
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
The CVE record's description, from microsoft
- CVE published
- 14 April 2026
- Assigned by
- microsoft
- CVSS
- 7.8 High (CVSS 3.1, from the CNA)
- CWE-1220
- Insufficient Granularity of Access Control
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
- CISA changed its entry. Ransomware use: Unknown to Known.
Defender: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2022-44698SmartScreen Security Feature Bypass | Microsoft Defender | Patch this weekRansomware use; EPSS 0.76 | 0.76 | ||
| CVE-2021-1647Remote Code Execution | Microsoft Defender | Patch soon | 0.39 | ||
| CVE-2026-45498Denial of Service | Microsoft Defender | Patch soon | 0.01 | ||
| CVE-2026-41091Link Following | Microsoft Defender | Patch soon | 0.00 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org