Cyber Posture

CVE-2026-45498

MediumCISA KEVActive Exploitation

Published: 20 May 2026

Published
20 May 2026
Modified
20 May 2026
KEV Added
20 May 2026
Patch
CVSS Score 4.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS Score N/A
Risk Priority 28 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-45498 is a medium-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Microsoft Defender Antimalware Platform. Its CVSS base score is 4.0 (Medium).

Operationally, CISA has added it to the Known Exploited Vulnerabilities catalog.

Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-400

Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.

addresses: CWE-400

Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.

addresses: CWE-400

Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.

addresses: CWE-400

Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.

addresses: CWE-400

Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.

addresses: CWE-400

Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.

addresses: CWE-400

The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.

addresses: CWE-400

Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.

NVD Description

Microsoft Defender Denial of Service Vulnerability

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
KEV Date Added
20 May 2026

Affected Products

microsoft
defender antimalware platform
4.18.26030.3011 — 4.18.26040.7

References