Microsoft Exchange Server
CVE-2026-45504 — Microsoft Exchange Server Elevation of Privilege Vulnerability
Executive Summary
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.7
EPSS Score
0.00846
probability of exploitation in the next 30 days
0.5489 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | 5094144 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5094142 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5094140 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server Subscription Edition RTM | 5094139 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5094144 |
Security Update | Yes |
5094142 |
Security Update | Yes |
5094140 |
Security Update | Yes |
5094139 |
Security Update | Yes |
Exploits & PoC
1 public PoCUnverified third-party code
Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.
| Repository | Stars | Published | Description |
|---|---|---|---|
| hawktrace/CVE-2026-45504 | 63 | 2026-06-24 | CVE-2026-45504 Microsoft Exchange File Read |
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
MARIOS GYFTOS
References
On This Page