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CVE-2017-18918

18
FAUCET Score

CVE-2017-18918 describes a vulnerability in Mattermost Server versions prior to 3.7.3 and 3.6.5, allowing a System Administrator to place a SAML certificate at an arbitrary file path. This medium-severity vulnerability (CVSS 4.9) has a network attack vector and low complexity, potentially leading to high integrity impact, though confidentiality and availability are not directly affected. There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB, with minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.6.0, < 3.6.5CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 3.7.0, < 3.7.3CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 34th percentile among its peer group of 3,565 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)

gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.6.5
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.7.3

Vendor Advisories (1)

goGHSA-5ghq-28r7-qwfjmedium

Mattermost Server does not restrict SAML certificate path for System Administrators

May 24, 2022

References

mattermost.com / security-updates
Vendor Advisory