CVE-2026-14259 Affecting mattermost-10.11-compat package, versions <10.11.23-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-MINIMOSLATEST-MATTERMOST1011COMPAT-20653465
- published9 Oct 2026
- disclosed14 Sept 2026
Introduced: 14 Sep 2026
CVE-2026-14259 (opens in a new tab)How to fix?
Upgrade Minimos:latest mattermost-10.11-compat to version 10.11.23-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mattermost-10.11-compat package and not the mattermost-10.11-compat package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to enforce board creation permissions when importing archive files which allows an authenticated non-guest team member to create Open or Private boards despite administrator restrictions via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00712