CVE-2026-45498
4.0 · MEDIUM Actively ExploitedOverview
CVE-2026-45498 is a medium-severity vulnerability affecting microsoft defender_antimalware_platform. It was published on May 20, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
Microsoft Defender Denial of Service Vulnerability
Remediation
Check the references section for vendor advisories and patches from microsoft. Update defender_antimalware_platform to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| microsoft | defender_antimalware_platform | >= 0, < 4.18.26040.7 | Affected |
Frequently Asked Questions
What is CVE-2026-45498?
CVE-2026-45498 is a medium-severity vulnerability affecting microsoft defender_antimalware_platform. It was published on May 20, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2026-45498?
This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-45498?
Check the references section for vendor advisories and patches from microsoft. Update defender_antimalware_platform to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-45498?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-45498 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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