CVE-2024-4183

Mattermost fails to limit the number of active sessions

4.3 MediumFix available

Mattermost versions 8.1.x before 8.1.12, 9.6.x before 9.6.1, 9.5.x before 9.5.3, 9.4.x before 9.4.5 fail to limit the number of active sessions, which allows an authenticated attacker to crash the server via repeated requests to the getSessions API after flooding the sessions table.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.61%Up 0.6 points since Apr 27, 2024

What each source reports

CVE List Score used 4.3

Record: CVE-2024-4183
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2024-1321 4.3

Record: EUVD-2024-1321
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-wj37-mpq9-xrcm 4.3

Mattermost fails to limit the number of active sessions

Record: GHSA-wj37-mpq9-xrcm
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400, CWE-770
Updated: 2026-11-02

NVD 4.3

Record: CVE-2024-4183
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-770
Updated: 2026-11-02

OSV 4.3

Record: CVE-2024-4183
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

OSVGHSA-wj37-mpq9-xrcm 4.3

Mattermost fails to limit the number of active sessions

Record: GHSA-wj37-mpq9-xrcm
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400, CWE-770
Updated: 2026-11-02

OSVGO-2024-2798 No score

Mattermost fails to limit the number of active sessions in github.com/mattermost/mattermost-server

Mattermost fails to limit the number of active sessions in github.com/mattermost/mattermost-server

Record: GO-2024-2798
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	9.4.0 to 9.4.4	9.4.5
`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	9.4.0 up to 9.4.5	9.4.5
`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, 9.4.0+incompatible up to 9.4.5+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+incompatible9.4.5+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-2024-4183 is a medium vulnerability (CVSS 4.3) in Mattermost, published April 26, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in github.com/mattermost/mattermost-server 9.6.1.