CVE-2026-93846 Team admin can escalate a team member's permissions via the team member roles endpoint
Low 3.8
Published
Updated
Check this codebase for CVE-2026-93846 and fix it if it is affected.
What it is: CVE-2026-93846 is a low-severity vulnerability in Mattermost, published on 26 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-93846 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-2026-93846/ (Markdown: https://insights.sbomify.com/CVE-2026-93846/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-93846?
CVE-2026-93846 is a low-severity vulnerability in Mattermost, published on 26 Oct 2026.
Official description
Mattermost versions 11.7.x <= 11.7.10 fail to restrict which built-in roles can be assigned to a team member via the API, which allows a team admin to grant a team member permissions beyond those permitted by the configured permission scheme via the {{update-team-member-roles}} REST API.. Mattermost Advisory ID: MMSA-2026-00734
Weakness: CWE-863
Which versions are affected by CVE-2026-93846?
How do I fix CVE-2026-93846?
No fix has been published for CVE-2026-93846 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93846 being exploited?
There is no known exploitation of CVE-2026-93846 in the wild and no public exploit code.
Sources
Also known as GHSA-39rf-335p-gqxg.