CVE-2017-18911 describes a critical vulnerability in Mattermost Server versions before 3.8.2, 3.7.5, and 3.6.7, where X.509 certificate validation for TLS-based email servers can be bypassed. This flaw carries a CVSS score of 9.1 (CRITICAL), indicating a network-based attack with low complexity that could lead to complete compromise of confidentiality and integrity without user interaction. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion with 11 mentions, suggesting awareness and potential for future exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.6.7CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 3.7.0, < 3.7.5CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 3.8.0, < 3.8.2CPE 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:N/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.