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CVE-2026-93847low3.5

Improper post type validation on scheduled post endpoints

Impact

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

Source excerpt · Mattermost

What to do

Update Mattermost to versions 11.11.0, 11.7.11 or higher.

Mattermost guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Mattermost · Mattermost

Other versions: unaffected

Version / rangeSource status
11.7.0 through 11.7.10 (inclusive)affected
11.11.0unaffected
11.7.11unaffected
Mattermost version evidence

Original source 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

References