Quick answers
- Is CVE-2026-13411 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-13411 being exploited in the wild.
- How severe is CVE-2026-13411?
- Medium severity, with a CVSS score of 4.3, published 22 October 2026.
- Which products and versions are affected?
- Mattermost Playbooks 11.7.x through 11.7.11.
- Is there a fix for CVE-2026-13411?
- 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-2026-13411 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-13411?
- Check whether you run Mattermost Playbooks 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 a denial-of-service flaw in the Playbooks plugin's import condition decoder that lacks null validation. An authenticated attacker can send a malicious playbook import request with a null condition element, causing an unhandled exception that crashes the Playbooks plugin instance-wide. The attack requires valid authentication to the Mattermost server.
Affected products
- Mattermost Playbooks 11.7.x through 11.7.11
Timeline
- 2026-10-22: disclosed