CVE-2018-21259 is a denial-of-service vulnerability affecting Mattermost Server versions prior to 4.10.1, 4.9.4, and 4.8.2. An unauthenticated attacker can exploit this by sending a malformed link to a channel, causing the application to hang. Rated as Medium severity (CVSS 5.3), this vulnerability is easily exploitable over the network with low attack complexity, leading to a denial of service. There is no impact on confidentiality or integrity. Currently, there is no evidence of active exploitation, nor are there any public exploit modules or proof-of-concept code available. The vulnerability has received minimal community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.8.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 4.9.0, < 4.9.4CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 4.10.0, < 4.10.1CPE 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: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.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.