Microsoft Exchange Online Elevation of Privilege Vulnerability

published 2026-06-19 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-38090

cvss: 9.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

Missing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

Patch / fix

links 1

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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 4 mo ago (2026-06-23)

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CNA	3.1	9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

Microsoft Microsoft Exchange Online

Classification

Weakness

CWE-862 Missing Authorization

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2026-48582
vendor-advisory, patch

Sources

CVE List CVE-2026-48582
NVD CVE-2026-48582

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary