CVE-2026-48579

FAUCET Score

Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.

First published: Jun 4, 2026Last modified: Jun 4, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:microsoft:exchange_online:-:::::::*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

Exploitability Score

3.9

Impact Score

5.2

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.01%

Probability of exploitation in next 30 days

EPSS Percentile

59.7%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0101 is in the 45th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

microsoftvendor investigatingvia nvd_reference

View patch

Vendor Advisories (1)

microsoft2026-Jun/CVE-2026-48579Critical

Microsoft Exchange Online Information Disclosure Vulnerability

Jun 4, 2026

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2026-48579

Vendor Advisory