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

mediumCVSS 5CVE-2026-45502
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoftproduct: Exchange ServerServer-side request forgery
What
Server-side request forgery in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Who is affected
Authorized users of Microsoft Exchange Server.
Urgency
Remediation is medium priority due to the moderate severity of the information disclosure risk.
Action
Update Microsoft Exchange Server to the latest version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45502

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45502coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Exchange Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center