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CVE-2018-8558

23
FAUCET Score

CVE-2018-8558 is an information disclosure vulnerability affecting Microsoft Office and Office 365 ProPlus. It occurs when Microsoft Outlook fails to enforce "Default link type" settings configured in the SharePoint Online Admin Center, potentially exposing sensitive information. Rated 6.5 Medium on the CVSS scale, this vulnerability allows an unauthenticated attacker to achieve high confidentiality impact with low attack complexity, requiring no user interaction. There is no evidence of active exploitation, public exploit code, or Metasploit modules, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.58%
Probability of exploitation in next 30 days
EPSS Percentile
92.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0558 is in the 98th percentile among its peer group of 21,974 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 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 32-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 64-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Office 365 ProPlus for 32-bit Systems
microsoftpatch availablevia msrc
Product: Office 365 ProPlus for 64-bit Systems

Vendor Advisories (1)

microsoft2018-Nov/CVE-2018-8558Important

Microsoft Outlook Information Disclosure Vulnerability

Nov 13, 2018

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2018-8558
PatchVendor Advisory
securityfocus.com / bid/105826
Third Party AdvisoryVDB Entry