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CVE-2017-18916

19
FAUCET Score

CVE-2017-18916 is a medium-severity vulnerability affecting Mattermost Server versions prior to 3.8.2, 3.7.5, and 3.6.7. It involves an access control issue where the API endpoint does not properly enforce integration permission restrictions, potentially allowing unauthorized access to certain functionalities. The vulnerability has a CVSS score of 5.3, indicating a network-based attack with low complexity, requiring no user interaction, and leading to a low impact on integrity without affecting confidentiality or availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, though it has received minimal media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.7CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 3.7.0, < 3.7.5CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
>= 3.8.0, < 3.8.2CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0077 is in the 32nd percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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 (3)

gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.6.7-0.20170420152529-0968e4079e0a
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.7.5
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 3.8.2

Vendor Advisories (1)

goGHSA-x33g-375j-jhf7medium

Mattermost Server has Improper Authorization for Integration Requests

May 24, 2022

References

mattermost.com / security-updates
Vendor Advisory