The Update BureauKB5050673
Hotfix update for Exchange Server 2019 CU14, April 2025
The Exchange Server 2019 CU14 hotfix addresses one Important-severity vulnerability. It is available only to organizations enrolled in the Extended Security Update program.
Does it affect you? Applies to: Organizations enrolled in the Extended Security Update program that run Exchange Server 2019 CU14.
For servers running Cumulative Update 14: each cumulative update gets its own update. Support for this version ended on October 14, 2025: Microsoft releases this update only to organizations enrolled in the Extended Security Update (ESU) program, not through Microsoft Update. The others should move to Exchange Server Subscription Edition. Which version am I on?
In detail
- Security Addresses one Important-severity vulnerability.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-04-18
- Classification
- Updates
- Type
- Cumulative update
- Servicing branch
- CU14
- Replaces
- KB5049233
- Replaced by
- KB5057652
| Version | Build | Channel |
|---|---|---|
| 2019 | 15.2.1544.25 | General availability |
Security
| Vulnerability | Severity | CVSS |
|---|---|---|
|
Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability
|
Important | 8.0 |
Sources
Checked automatically: 8 of 8 checks passed · compared with Microsoft's page on Nov 8, 2026
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake