CVE-2026-2325
MEDIUM4.3EPSS 0.05%Mattermost doesn't limit the size of the request body on the start meeting API endpoint
Published: 5/18/2026Modified: 6/1/2026
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request to {{/api/v1/meetings}}.. Mattermost Advisory ID: MMSA-2026-00608
Affected packages (2)
- Go/github.com/mattermost/mattermost-plugin-msteams-meetingsfrom 0, < 1.1.1-0.20260213105619-c5892dd169de
- Go/github.com/mattermost/mattermost-server>= 11.5.0, < 11.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |