CVE-2024-4182

Mattermost crashes web clients via a malformed custom status

4.3 MediumFix available

Mattermost versions 9.6.0, 9.5.x before 9.5.3, 9.4.x before 9.4.5, and 8.1.x before 8.1.12 fail to handle JSON parsing errors in custom status values, which allows an authenticated attacker to crash other users' web clients via a malformed custom status.

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

0.55%Up 0.5 points since Apr 27, 2024

What each source reports

CVE List Score used 4.3

Record: CVE-2024-4182
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-754
Updated: 2026-11-02

EUVDEUVD-2024-1158 4.3

Record: EUVD-2024-1158
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-8f99-g2pj-x8w3 4.3

Mattermost crashes web clients via a malformed custom status

Record: GHSA-8f99-g2pj-x8w3
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-754
Updated: 2026-11-02

NVD 4.3

Record: CVE-2024-4182
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-754
Updated: 2026-11-02

OSV 4.3

Record: CVE-2024-4182
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-754
Updated: 2026-11-02

OSVGHSA-8f99-g2pj-x8w3 4.3

Mattermost crashes web clients via a malformed custom status

Record: GHSA-8f99-g2pj-x8w3
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-754
Updated: 2026-11-02

OSVGO-2024-2795 No score

Mattermost crashes web clients via a malformed custom status in github.com/mattermost/mattermost-server

Mattermost crashes web clients via a malformed custom status in github.com/mattermost/mattermost-server

Record: GO-2024-2795
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`github.com/mattermost/mattermost-server` Go	8.1.0 to 8.1.11	8.1.12
`github.com/mattermost/mattermost-server` Go	9.4.0 to 9.4.4	9.4.5
`github.com/mattermost/mattermost-server` Go	9.5.0 to 9.5.2	9.5.3
`github.com/mattermost/mattermost-server` Go	9.6.0-rc1 to 9.6.0	9.6.1
`github.com/mattermost/mattermost-server` Go	8.1.0 up to 8.1.12	8.1.12
`github.com/mattermost/mattermost-server` Go	9.4.0 up to 9.4.5	9.4.5
`github.com/mattermost/mattermost-server` Go	9.5.0 up to 9.5.3	9.5.3
`github.com/mattermost/mattermost-server` Go	9.6.0-rc1 up to 9.6.1	9.6.1
`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-2024-4182 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 0.55%, the 46th percentile. Fixed in github.com/mattermost/mattermost-server 8.1.12.