CVE-2017-8559

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2017-8559 is fixed in 3 products on 1 platform, first by KB4018588, released July 11, 2017. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
n/a
Important
Exploitation
None reported
Exploitation Unlikely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0342
88th percentile

<p>An elevation of privilege vulnerability exists when Microsoft Exchange Outlook Web Access (OWA) fails to properly handle web requests. An attacker who successfully exploited this vulnerability could perform script/content injection attacks and attempt to trick the user into disclosing sensitive information.</p> <p>To exploit the vulnerability, an attacker could send a specially crafted email message containing a malicious link to a user. Alternatively, an attacker could use a chat client to social engineer a user into clicking the malicious link.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Exchange validates web requests.</p> <p>Note: In order to exploit this vulnerability, a user must click a maliciously crafted link from an attacker.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Microsoft Exchange Server 2013 Cumulative Update 16 KB4018588 Jul 11, 2017
Microsoft Exchange Server 2013 Service Pack 1 KB4018588 Jul 11, 2017
Microsoft Exchange Server 2016 Cumulative Update 5 KB4018588 Jul 11, 2017