Quick answers
- Is CVE-2026-14344 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-14344 being exploited in the wild.
- How severe is CVE-2026-14344?
- Medium severity, with a CVSS score of 4.3, published 14 September 2026.
- Which products and versions are affected?
- Mattermost 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22.
- Is there a fix for CVE-2026-14344?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-14344 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-14344?
- Check whether you run Mattermost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authorization bypass in Mattermost's board-creation permission enforcement. Authenticated users can circumvent the board-creation permission check by submitting requests through the board-duplication, boards-and-blocks, and archive-import API endpoints, which fail to validate the user's permission level before processing board creation. An attacker must be an authenticated user with network access to the Mattermost instance, but does not require any elevated privileges. The impact allows unauthorized board creation, potentially enabling workspace hijacking or data compartmentalization attacks. Fixes are available in patched versions: 11.9.1+, 11.8.5+, 11.7.8+, and 10.11.23+.
Affected products
- Mattermost Mattermost 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22
Timeline
- 2026-09-14: disclosed