CVE-2026-4055

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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 Server 10.11.x < 10.11.17 / 11.5.x < 11.5.5 / 11.6.x < 11.6.2 Improper Authorization (MMSA-2026-00629)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2026-00629 advisory. - Mattermost Server fails to validate team-level runcreate permission against the target team when creating a playbook run which allows an authenticated team...

RHSA-2026:19714 Red Hat Security Advisory: rhc-worker-playbook security update

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GHSA-6CFR-WP44-6QMV Mattermost has an Incorrect Authorization issue

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

CVE-2026-4055

Mattermost CVE-2026-4055 affects Mattermost versions 11.5.x

CVE-2026-4055 Insufficient permission validation on cross-team playbook run creation

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

CVE-2026-4055

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

CVE-2026-4055 Insufficient permission validation on cross-team playbook run creation

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

EUVD-2026-31221

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

CVE-2026-4055 Insufficient permission validation on cross-team playbook run creation

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate 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...

PT-2026-42404

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.x through 11.5.1 Description An incorrect authorization issue exists during the creation of a playbook run. The system fails to validate the team-level run create permission against the target team. This allows an...

Important: Red Hat Security Advisory: rhc-worker-playbook security update

An update for rhc-worker-playbook is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is...

RHSA-2026:19132 Red Hat Security Advisory: rhc-worker-playbook security update

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Astra Linux – Vulnerability in Ansible

A flaw in log handling was discovered in Ansible when using the uri module, which exposes sensitive data to content and json output. This flaw allows attackers to access logs or outputs of executed tasks, thereby enabling them to read keys used in playbooks from other users within the uri module...

Important: Red Hat Security Advisory: rhc-worker-playbook security update

An update for rhc-worker-playbook is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each...

RHEL 10 : rhc-worker-playbook (RHSA-2026:19132)

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:19132 advisory. A worker for yggdrasil that receives Ansible playbooks and executes them against the local host. Security Fixes: golang: net/url: Memory...

Incorrect Authorization

Overview github.com/mattermost/mattermost-plugin-playbooks/server/app is a package for reliable and repeatable processes using checklists, automation, and retrospectives Affected versions of this package are vulnerable to Incorrect Authorization via the PUT API endpoint when updating playbooks. A...

GHSA-GVG4-JHMR-6J23 Mattermost doesn't check if {{team_id}} was being changed when updating playbooks

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to check if teamid was being changed when updating playbooks, allowing users with only Manage Playbook Configurations permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID:...

Mattermost doesn't check if {{team_id}} was being changed when updating playbooks

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to check if teamid was being changed when updating playbooks, allowing users with only Manage Playbook Configurations permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID:...

CVE-2026-6343

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591...