OnlyFm252
Microsoft Exchange Server

CVE-2026-45502 — Microsoft Exchange Server Information Disclosure Vulnerability

Important CVSS 5 EPSS 0.00424 2026-06 archive

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
Category Information Disclosure
Released Jun 9 2026
Last Updated Jun 9 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00424 — 0.33742 percentile
NVD CVSS 5 MEDIUM — matches MSRC

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

0.00424
probability of exploitation in the next 30 days
0.33742 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

Acknowledgments

DongJun Kim (smlijun), Hwiwon Lee (hwiwonl) with UIUC, Jongseong Kim (nevul37) with UIUC, Younggi Park (grill66) with UIUC, TALHA GÜNAY

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