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4.3
CVE-2026-16046: Mattermost allows editing of completed playbook runs
CVE-2026-16046 · published 2 months ago
Summary
In certain Mattermost versions, the system does not stop users from changing details of a playbook that has already finished. This means someone could alter the status, checklists, notes, owner, or participant list after the work is done, potentially compromising records. Update to the latest Mattermost release or apply the provided patch to restore proper protection.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| mattermost | mattermost | <= 11.7.6 |
Original advisory text
Missing run-state validation on finished playbook runs
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to enforce run-state validation on write operations for finished playbook runs which allows a run participant to modify status, checklists, retrospective content, ownership, and participants on completed runs via REST and GraphQL API requests. Mattermost Advisory ID: MMSA-2026-00675
References
- https://mattermost.com/security-updates Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16046... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-16046 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-863Incorrect Authorization
Timeline
Published17 Aug 2026
Updated4 Nov 2026
First seen17 Aug 2026
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