Microsoft Exchange Server ↗
On-premises Exchange Server only. Exchange Online (Microsoft 365) is a cloud service patched by Microsoft and is not covered here.
Summary iPlain-English security verdict for Microsoft Exchange Server, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Microsoft Exchange Server currently scores 44/100 — high risk. No tracked vulnerabilities are currently known to be exploited in the wild. The latest supported release is 15.2.2562.43. Upgrade soon — serious vulnerabilities are open and a fix usually exists. Note: this product is assessed at the product level on recent (365-day) activity rather than an exact per-version match, so it is never marked a confident "healthy".
Disclosure trend iNew CVEs published for Microsoft Exchange Server each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
Most urgent first — actively exploited, then likeliest to be exploited.
CVE-2026-55008 CRITICAL Cross-site scripting (XSS) EPSS 1% → fixed in 15.02.2562.045See all 11 known Microsoft Exchange Server CVEs & security history →
How to patch Microsoft Exchange Server — step-by-step to the latest secure version →
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Versions & lifecycle iWhen each release line stops receiving security patches (end-of-life). After EOL there are no more fixes — plan upgrades before these dates.
How long each Microsoft Exchange Server release line is supported — and when it sunsets.
Full Microsoft Exchange Server end-of-life dates & support timeline →
Frequently asked
Is Microsoft Exchange Server safe and patched?
Microsoft Exchange Server currently scores 44/100 — high risk. No tracked vulnerabilities are currently known to be exploited in the wild. The latest supported release is 15.2.2562.43. Upgrade soon — serious vulnerabilities are open and a fix usually exists. Note: this product is assessed at the product level on recent (365-day) activity rather than an exact per-version match, so it is never marked a confident "healthy".
What should I do about Microsoft Exchange Server now?
Upgrade Microsoft Exchange Server to the latest supported release (15.2.2562.43) or later and apply available security updates, then confirm against Microsoft's official advisory.
When does Microsoft Exchange Server reach end-of-life?
The latest supported Microsoft Exchange Server release is 15.2.2562.43. After end-of-life a release no longer receives security patches.
Which versions of Microsoft Exchange Server are still receiving security updates?
Supported Microsoft Exchange Server release lines (latest 15.2.2562.43): subscription. End-of-life releases no longer receive security patches.
product-level posture (last 365d); exact per-version verdict pending precise version mapping
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Microsoft's official advisory before you patch or upgrade — Microsoft Exchange Server official site ↗