CVE-2017-18911
CRITICAL9.1EPSS 0.14%Mattermost Server has X.509 Improper Certificate Validation
Published: 5/24/2022Modified: 2/22/2026
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.
Affected packages (2)
- Go/github.com/mattermost/mattermost-serverfrom 0, < 3.6.7-rc1
- Go/github.com/mattermost/mattermost-serverfrom 0, < 3.6.7-rc1+incompatible, >= 3.7.0+incompatible, < 3.7.5+incompatible, >= 3.8.0+incompatible, < 3.8.2+incompatible
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
References (7)
- ADVISORYhttps://github.com/advisories/GHSA-m462-mqw4-2c8m
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2017-18911
- PATCHhttps://github.com/mattermost/mattermost
- WEBhttps://github.com/mattermost/mattermost/commit/222bce0c5c1abb2f58c3a6de1fe8c5d3accffb21
- WEBhttps://github.com/mattermost/mattermost/commit/691c18157025d4808b5b11de1d6de01050e54fa6
- WEBhttps://github.com/mattermost/mattermost/commit/e9bb8cdfb4915067349a4840ab15ff941c4eb070
- WEBhttps://mattermost.com/security-updates