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CVE-2017-8758

22
FAUCET Score

CVE-2017-8758 is a cross-site scripting (XSS) vulnerability in Microsoft Exchange Server 2016's Outlook Web Access (OWA) that could lead to elevation of privilege. This medium-severity flaw (CVSS 6.1) requires user interaction and a network attack vector, potentially resulting in limited impact to confidentiality and integrity. While it has a low EPSS score and is not listed in CISA's KEV catalog, there is no public exploit code available, and community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.38%
Probability of exploitation in next 30 days
EPSS Percentile
87.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0338 is in the 94th percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Exchange Server 2016 Cumulative Update 6
View patch

Vendor Advisories (1)

microsoft2017-Sep/CVE-2017-8758Important

Microsoft Exchange Server Elevation of Privilege Vulnerability

Sep 12, 2017

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2017-8758
PatchVendor Advisory
securityfocus.com / bid/100723
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039320
Third Party AdvisoryVDB Entry