Actively exploitedCVSS 7.8 · HIGH

CVE-2026-33825Privilege Escalation in Microsoft Defender

Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.

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Analysis

Esta vulnerabilidad en Microsoft Defender permite a un atacante con acceso local elevar sus privilegios para tomar control total del sistema. El fallo está siendo explotado activamente según el reporte de CISA, lo que pone en riesgo estaciones de trabajo y servidores Windows. Es necesario asegurar que las actualizaciones automáticas del motor antimalware estén aplicadas.

Severity

Score: 7.8(HIGH)

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AV: LOCAL

AC: LOW

PR: LOW

UI: NONE

S: UNCHANGED

C: HIGH

I: HIGH

A: HIGH

Weakness (CWE): CWE-1220

CISA KEV

Added to KEV: 2026-04-22

Federal patch deadline: 2026-05-06

Known ransomware use: Unknown

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS

Probability of exploitation (next 30 days): 0.0675 (6.7%)

Percentile: 93.3%

EPSS: 2026-07-24

Affects

microsoft:defender_antimalware_platform

Technical description

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

Published: 4/14/2026, 6:17:35 PM

Last modified: 7/24/2026, 10:10:00 PM

References

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

Categorías de impacto que evalúa la IA

widely_deployed_infra — kernel Linux, OpenSSL, glibc, k8s, Docker, nginx, OpenSSH.

popular_dev_tooling — Node.js, Python, Go, React, Next.js, librerías comunes de npm/pip.

common_consumer_software — Chrome, Firefox, Windows, macOS, apps móviles populares.

enterprise_saas — GitHub, GitLab, Atlassian, Salesforce, Cisco, Fortinet, Ivanti.

niche_software — CMS regionales, herramientas de hobby, librerías de poco uso.

not_relevant — firmware específico de proveedor, software descontinuado.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.