CVE-2026-70279
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
- Critical
- CVSS 9.3
- EPSS 0.86%
- Fixed version listed
What to do
Fixed version listed
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 (x64-based Systems) | from 15.01.0.0, before 15.01.2507.077 | 15.01.2507.077 |
| Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 (x64-based Systems) | from 15.02.0.0, before 15.02.1544.050 | 15.02.1544.050 |
| Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 (x64-based Systems) | from 15.02.0.0, before 15.02.1748.055 | 15.02.1748.055 |
| Microsoft Microsoft Exchange Server Subscription Edition RTM (x64-based Systems) | from 15.02.0.0, before 15.02.2562.056 | 15.02.2562.056 |
Advisories and fixes
- Vendor advisory msrc.microsoft.com
Scores and signals
- Exploitation
- No known exploitation
- Severity
- Critical, CVSS 9.3 (v3.1, scored by microsoft)
- EPSS
- 0.86% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 24, 2026)
- CISA's SSVC decision points
- Exploitation: none. Automatable: no. Technical impact: total. As of Oct 13, 2026.
- Weakness
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Vendor
- Microsoft, Microsoft Exchange Server 2016 Cumulative Update 23
Timeline
- First listed as critical by cve.now. Affected and fixed versions come from the CVE record, once one is published.