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.
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20260320113102-f2b3d1c6a945 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanMattermost has an Incorrect Authorization issue affects github.com/mattermost/mattermost/server/v8 (go). Severity is medium. 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.
AI coding agents often install or upgrade packages automatically in go. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/mattermost/mattermost/server/v8go | >=8.0.0-20260304132957-9f2616376582,<8.0.0-20260320113102-f2b3d1c6a945 |
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.
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20260320113102-f2b3d1c6a945 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanMattermost has an Incorrect Authorization issue affects github.com/mattermost/mattermost/server/v8 (go). Severity is medium. 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.
AI coding agents often install or upgrade packages automatically in go. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/mattermost/mattermost/server/v8go | >=8.0.0-20260304132957-9f2616376582,<8.0.0-20260320113102-f2b3d1c6a945 |
| 8.0.0-20260320113102-f2b3d1c6a945 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard| 8.0.0-20260320113102-f2b3d1c6a945 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard