All vulnerabilities
CVE-2026-93847

Mattermost: Improper post type validation on scheduled post endpoints

Mattermost MattermostApplications & CMS
Open in ThreatlineRecord JSON
CVSS
3.5Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published26 Oct 2026Updated 26 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Mattermost versions 11.7.x <= 11.7.10 fail to validate reserved system post types on the scheduled post creation and publication paths which allows an authenticated channel member to publish messages rendering as trusted system events via the scheduled post endpoint.. Mattermost Advisory ID: MMSA-2026-00732

Text from CVE List

Affected versions 3

  • Mattermostaffected: 11.7.0 through 11.7.10CVE List
  • Mattermostunaffected: 11.11.0CVE List
  • Mattermostunaffected: 11.7.11CVE List

References 1