Malware Protection Engine vulnerabilities: known CVEs & security history
Microsoft · Actively exploited · 5 tracked CVEs · 1 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Malware Protection Engine release lines — 5 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Malware Protection Engine's current status and the safe version to run.
Known Malware Protection Engine CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-41091⚡ exploited | high | 7.8 | 8% | 2026 |
| CVE-2026-45584 | high | 8.1 | 1% | 2026 |
| CVE-2026-55012 | high | 7.8 | 0% | 2026 |
| CVE-2026-55011 | high | 7.8 | 0% | 2026 |
| CVE-2026-50656 | high | 7.8 | 3% | 2026 |
Is my Malware Protection Engine version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Malware Protection Engine version → · Monitor Malware Protection Engine for new CVEs →
Malware Protection Engine vulnerabilities — frequently asked
How many known vulnerabilities does Malware Protection Engine have?
IsItPatched tracks 5 CVEs for Malware Protection Engine, 1 of which is actively exploited (CISA KEV). 0 are critical-severity and 5 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Malware Protection Engine have any actively-exploited vulnerabilities?
Yes — 1 Malware Protection Engine CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild. Patch it as a priority.
What is the most severe Malware Protection Engine vulnerability?
Among tracked issues, CVE-2026-41091 (HIGH, CVSS 7.8), which is actively exploited, ranks highest — a CWE-59 weakness.
Is Malware Protection Engine safe to use?
It depends on the version. The latest supported Malware Protection Engine release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Malware Protection Engine security status · Malware Protection Engine end-of-life · actively-exploited CVEs. Always verify against Microsoft's advisories — see our disclaimer.