CVE-2017-18873 describes a denial-of-service vulnerability in Mattermost Server versions prior to 4.3.0, 4.2.1, and 4.1.2. An unauthenticated attacker can exploit this flaw by sending a specially crafted, misformatted post, leading to channels becoming invisible to users. This issue is rated Medium severity (CVSS 5.3) due to its low attack complexity and potential for denial of service, though it does not impact confidentiality or integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in CISA's KEV catalog, with minimal community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.1.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 4.2.0, < 4.2.1CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
4.3.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc1:*:*:*:*:*:* | ||
4.3.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc2:*:*:*:*:*:* | ||
4.3.0CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc3:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.