CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-45503: Microsoft Exchange Server Information Disclosure Vulnerability

highCVSS 8.1CVE-2026-45503
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 forgeryInformation disclosure
What
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Who is affected
Authorized users of Microsoft Exchange Server are affected.
Urgency
Remediation is urgent due to the high severity and potential for information disclosure.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Exchange Server

Get an email when a new Exchange Server advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.1
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45503

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-2026-45503coverage & 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