CVE-2018-21263 describes an authentication bypass vulnerability in Mattermost Server versions prior to 4.7.0, 4.6.2, and 4.5.2. An attacker could leverage a specially crafted SAML response to authenticate as another user. This vulnerability carries a high severity CVSS score of 8.8, indicating a network-based attack with low privileges required, leading to high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.5.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 4.6.0, < 4.6.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
4.7.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc1:*:*:*:*:*:* | ||
4.7.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc2:*:*:*:*:*:* | ||
4.7.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.7.0:rc3:*:*:*:*:*:* |
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:H
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.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.