CVE-2024-4198

Mattermost fails to fully validate role changes

2.7 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.50%Up 0.5 points since Apr 27, 2024

What each source reports

CVE List Score used 2.7

Record: CVE-2024-4198
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

EUVDEUVD-2024-1107 2.7

Record: EUVD-2024-1107
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5qx9-9ffj-5r8f 2.7

Mattermost fails to fully validate role changes

Record: GHSA-5qx9-9ffj-5r8f
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

NVD 2.7

Record: CVE-2024-4198
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSV 2.7

Record: CVE-2024-4198
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSVGHSA-5qx9-9ffj-5r8f 2.7

Mattermost fails to fully validate role changes

Record: GHSA-5qx9-9ffj-5r8f
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSVGO-2024-2794 No score

Mattermost fails to fully validate role changes in github.com/mattermost/mattermost-server

Mattermost fails to fully validate role changes in github.com/mattermost/mattermost-server

Record: GO-2024-2794
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`github.com/mattermost/mattermost-server` Go	9.6.0-rc1 to 9.6.0	9.6.1
`github.com/mattermost/mattermost-server` Go	9.5.0 to 9.5.2	9.5.3
`github.com/mattermost/mattermost-server` Go	8.1.0 to 8.1.11	8.1.12
`github.com/mattermost/mattermost-server` Go	9.6.0-rc1 up to 9.6.1	9.6.1
`github.com/mattermost/mattermost-server` Go	9.5.0 up to 9.5.3	9.5.3
`github.com/mattermost/mattermost-server` Go	8.1.0 up to 8.1.12	8.1.12
`github.com/mattermost/mattermost-server` Go	8.1.0+incompatible up to 8.1.12+incompatible, 9.5.0+incompatible up to 9.5.3+incompatible, 9.6.0-rc1+incompatible up to 9.6.1+incompatible	8.1.12+incompatible9.5.3+incompatible9.6.1+incompatible

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-4198 is a low vulnerability (CVSS 2.7) in Mattermost, published April 26, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 43rd percentile. Fixed in github.com/mattermost/mattermost-server 9.6.1.