Microsoft Exchange Server
CVE-2026-45503 — Microsoft Exchange Server Information Disclosure Vulnerability
Executive Summary
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Overview
6.5
CVSS MEDIUM
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:N/A:N/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
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.1
EPSS Score
0.00428
probability of exploitation in the next 30 days
0.34077 percentile - updated 2026-06-21
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 | Information Disclosure | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5094142 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5094140 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Exchange Server Subscription Edition RTM | 5094139 (Security Update) |
Important | Information Disclosure | Yes |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5094144 |
Security Update | Yes |
5094142 |
Security Update | Yes |
5094140 |
Security Update | Yes |
5094139 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Anonymous, Vaibhavi Kalgutkar with Microsoft
References
On This Page