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CVE-2026-48579— Microsoft Exchange Online Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Online
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Exchange Online是美国微软（Microsoft）开源的一个企业级云邮件与日历服务。 Microsoft Exchange Online存在授权问题漏洞，该漏洞源于授权不当，可能导致未经授权的攻击者通过网络披露信息。

CVSS 9.1 · Critical EPSS 1.00% · P62

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Exchange Online - affected
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I. Basic Information for CVE-2026-48579

Vulnerability Information
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Vulnerability Title
Microsoft Exchange Online Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Online 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Exchange Online是美国微软（Microsoft）开源的一个企业级云邮件与日历服务。 Microsoft Exchange Online存在授权问题漏洞，该漏洞源于授权不当，可能导致未经授权的攻击者通过网络披露信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Exchange Online - -

II. Public POCs for CVE-2026-48579

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III. Intelligence Information for CVE-2026-48579

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Vendor Advisories for CVE-2026-48579 (1)

Same Patch Batch · Microsoft · 2026-06-04 · 6 CVEs total

CVE-2026-48567 10.0 CRITICAL Azure HorizonDB Elevation of Privilege Vulnerability
CVE-2026-45497 7.7 HIGH Microsoft M365 Copilot Remote Code Execution Vulnerability
CVE-2026-47655 6.5 MEDIUM Microsoft Graph Information Disclosure Vulnerability
CVE-2026-47644 6.5 MEDIUM Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
CVE-2026-42824 6.5 MEDIUM M365 Copilot Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft Exchange Online
Same vendor: Microsoft
Same weakness: CWE-285

V. Comments for CVE-2026-48579

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