Microsoft Exchange Server
CVE-2026-45502 — 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
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:C/C:L/I:N/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
CONFIDENTIALITY
Low
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.4
EPSS Score
0.20255
probability of exploitation in the next 30 days
0.97238 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 | 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 |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
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
DongJun Kim (smlijun)
Hwiwon Lee (hwiwonl) with UIUC
Jongseong Kim (nevul37) with UIUC
Younggi Park (grill66) with UIUC
TALHA GÜNAY
References
On This Page