CVE-2017-18909

7.5 highEPSS 0.7%

An issue was discovered in Mattermost Server before 3.9.0 when SAML is used. Encryption and signature verification are not mandatory.

Severity

7.5 high

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

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-31)
CWE: CWE-295
Published: 2020-06-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-r6j5-fqx9-7qv9	Go	github.com/mattermost/mattermost-server	<3.8.1-0.20170504181128-4f074fed0d65	3.8.1-0.20170504181128-4f074fed0d65
GO-2026-4478	Go	github.com/mattermost/mattermost-server	all versions	no fix published