CVE-2026-13411 Null condition in Playbooks import crashes the plugin
Medium 4.3
Published
Updated
Check this codebase for CVE-2026-13411 and fix it if it is affected.
What it is: CVE-2026-13411 is a medium-severity vulnerability in Mattermost, published on 22 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-13411 in the wild and no public exploit code.
Affected product: Mattermost. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-13411/ (Markdown: https://insights.sbomify.com/CVE-2026-13411/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-13411?
CVE-2026-13411 is a medium-severity vulnerability in Mattermost, published on 22 Oct 2026.
Official description
Mattermost versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which allows an authenticated attacker to crash the Playbooks plugin instance-wide via a crafted import request containing a null condition. Mattermost Advisory ID: MMSA-2026-00709
Weakness: CWE-754
Which versions are affected by CVE-2026-13411?
How do I fix CVE-2026-13411?
No fix has been published for CVE-2026-13411 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-13411 being exploited?
There is no known exploitation of CVE-2026-13411 in the wild and no public exploit code.
Sources
Also known as GHSA-2273-qcv6-r2xj.