CVE-2017-18911 — Improper Certificate Validation in Mattermost Mattermost-server

CWE-295 — Improper Certificate Validation5 documents4 sources
Severity
9.1CRITICALNVD
EPSS
0.1%
top 66.62%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Github.com Mattermost Mattermost-serverMattermost Server
Timeline
PublishedJun 19
Latest updateFeb 17

Description

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitability: 3.9 | Impact: 5.2

Affected Packages2 packages

▶NVDmattermost/mattermost_server3.7.0 — 3.7.5+2

🔴Vulnerability Details

4
OSV
Mattermost Server has X.509 Improper Certificate Validation in github.com/mattermost/mattermost-server↗2026-02-17
▶
OSV
Mattermost Server has X.509 Improper Certificate Validation↗2022-05-24
▶
GHSA
Mattermost Server has X.509 Improper Certificate Validation↗2022-05-24
▶
CVEList
CVE-2017-18911: An issue was discovered in Mattermost Server before 3↗2020-06-19
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CVE-2017-18911 — Improper Certificate Validation | cvebase