CVE-2017-18906 describes an account takeover vulnerability in Mattermost Server versions prior to 4.0.0, 3.10.2, and 3.9.2, specifically when Single Sign-On OAuth2 is utilized. This flaw, rated 8.1 HIGH on the CVSS scale, allows an authenticated attacker to claim another user's account with low attack complexity, leading to high confidentiality and integrity impacts. There is no evidence of active exploitation, publicly available exploit code, or inclusion in the KEV catalog, though it has received some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.9.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 3.10.0, < 3.10.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.