CVE-2024-41926

Malicious remote can claim that a user was synced from another remote

2.7 LowFix available

Mattermost versions 9.9.x <= 9.9.0 and 9.5.x <= 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote.

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

0.18%Up 0.1 points since Aug 2, 2024

What each source reports

CVE List Score used 2.7

Malicious remote can claim that a user was synced from another remote

Record: CVE-2024-41926
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-2024-2547 2.7

Record: EUVD-2024-2547
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-9fpw-c9x7-cv3j 5.1

Mattermost allows remote actor to set arbitrary RemoteId values for synced users

Record: GHSA-9fpw-c9x7-cv3j
CVSS 4.0: 5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
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, CWE-346
Updated: 2026-11-02

NVD 2.7

Record: CVE-2024-41926
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284, CWE-346
Updated: 2026-11-02

OSV 2.7

Malicious remote can claim that a user was synced from another remote

Record: CVE-2024-41926
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-9fpw-c9x7-cv3j 5.1

Mattermost allows remote actor to set arbitrary RemoteId values for synced users

Record: GHSA-9fpw-c9x7-cv3j
CVSS 4.0: 5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
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, CWE-346
Updated: 2026-11-02

OSVBIT-mattermost-2024-41926 No score

Record: BIT-mattermost-2024-41926
Updated: 2026-11-02

OSVGO-2024-3022 No score

Mattermost allows remote actor to set arbitrary RemoteId values for synced users in github.com/mattermost/mattermost-server

Mattermost allows remote actor to set arbitrary RemoteId values for synced users in github.com/mattermost/mattermost-server

Record: GO-2024-3022
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`github.com/mattermost/mattermost/server/v8` Go	9.5.0 up to 9.5.7	9.5.7
`github.com/mattermost/mattermost/server/v8` Go	9.9.0 to 9.9.0	9.9.1
`github.com/mattermost/mattermost/server/v8` Go	before 8.0.0-20240604093018-5114c3b7cdb8	8.0.0-20240604093018-5114c3b7cdb8
`github.com/mattermost/mattermost` Go	before 5.3.2-0.20240604093018-5114c3b7cdb8	5.3.2-0.20240604093018-5114c3b7cdb8
`mattermost` Bitnami	9.5.0 up to 9.5.7, 9.9.0 to 9.9.0	9.5.7
`github.com/mattermost/mattermost/server/v8` Go	9.9.0 up to 9.9.1	9.9.1
`github.com/mattermost/mattermost-server` Go	9.5.0+incompatible up to 9.5.7+incompatible, 9.9.0+incompatible up to 9.9.1+incompatible	9.5.7+incompatible9.9.1+incompatible
`github.com/mattermost/mattermost-server/v5` Go	All versions	None known
`github.com/mattermost/mattermost-server/v6` Go	All versions	None known
`github.com/mattermost/mattermost/server/v8` Go	All versions	None known

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-2024-41926 is a low vulnerability (CVSS 2.7) in Mattermost, published August 1, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 6th percentile. Fixed in github.com/mattermost/mattermost/server/v8 9.5.7.