CVE-2017-18906 — Improper Authentication in Mattermost Mattermost-server

CWE-287 — Improper AuthenticationCWE-613 — Insufficient Session Expiration5 documents4 sources
Severity
8.1HIGHNVD
EPSS
0.2%
top 56.71%
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 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used. An attacker could claim somebody else's account.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 2.8 | Impact: 5.2

Affected Packages2 packages

▶NVDmattermost/mattermost_server3.10.0 — 3.10.2+1

🔴Vulnerability Details

4
OSV
Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used in github.com/mattermost/mattermost-server↗2026-02-17
▶
GHSA
Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used↗2022-05-24
▶
OSV
Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used↗2022-05-24
▶
CVEList
CVE-2017-18906: An issue was discovered in Mattermost Server before 4↗2020-06-19
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CVE-2017-18906 — Improper Authentication | cvebase