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CVE-2026-48582: Microsoft Exchange Online Elevation of Privilege Vulnerability

criticalCVSS 9.6CVE-2026-48582
Missing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoftproduct: Exchange OnlinePrivilege escalation
What
This vulnerability allows an authorized attacker to elevate privileges over a network due to missing authorization.
Who is affected
Users of Microsoft Exchange Online.
Urgency
Remediation is critical due to the high severity and potential for privilege escalation.
Action
Apply the latest security updates from Microsoft.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.6
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48582

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-2026-48582coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Exchange Online

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