Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-4055 Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticate… https://www.cve.org/CVERecord?id=CVE-2026-4055
Post summary
The text announces a permission validation flaw in Mattermost (CVE‑2026‑4055) that could allow unauthorized playbook runs; no PoC, exploit, patch or active exploitation details are provided.
🚨*CVE* CVE-2026-4055 Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticate… https://www.cve.org/CVERecord?id=CVE-2026-4055 ----- Traducción: CVE-2026-4055 Mat… http://infoflow.cloud`
Post summary
The tweet announces CVE‑2026‑4055, describing a permission‑validation issue in Mattermost and linking to its CVE record.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | mattermost | mattermost_server | - | - | - |