CVE-2024-34029

Mattermost versions 9.5.x <= 9.5.3, 9.7.x <= 9.7.1 and 8.1.x <= 8.1.12 fail to perform a proper authorization check in the /api/v4/groups/<group-id>/channels/<channel-id>/link endpoint which allows a user to learn the members of an AD/LDAP group that is linked to a team by adding the group to a channel, even if the user has no access to the team.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://mattermost.com/security-updates	Vendor Advisory
https://mattermost.com/security-updates	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::

History

30 Sep 2025, 15:26

Type	Values Removed	Values Added
References	~~() https://mattermost.com/security-updates -~~	() https://mattermost.com/security-updates - Vendor Advisory
CPE		cpe:2.3:a:mattermost:mattermost_server::::::::
First Time		Mattermost mattermost Server Mattermost

21 Nov 2024, 09:17

Type	Values Removed	Values Added
References	~~() https://mattermost.com/security-updates -~~	() https://mattermost.com/security-updates -

28 May 2024, 12:39

Type	Values Removed	Values Added
Summary		(es) Las versiones 9.5.x <= 9.5.3, 9.7.x <= 9.7.1 y 8.1.x <= 8.1.12 de Mattermost no realizan una verificación de autorización adecuada en /api/v4/groups// canales//link endpoint que permite a un usuario conocer los miembros de un grupo AD/LDAP que está vinculado a un equipo agregando el grupo a un canal, incluso si el usuario no tiene acceso al equipo.

26 May 2024, 14:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-05-26 14:15

Updated : 2025-09-30 15:26

NVD link : CVE-2024-34029

Mitre link : CVE-2024-34029

CVE.ORG link : CVE-2024-34029

JSON object : View

Products Affected

mattermost

mattermost_server

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

{"id": "CVE-2024-34029", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "published": "2024-05-26T14:15:09.367", "references": [{"url": "https://mattermost.com/security-updates", "tags": ["Vendor Advisory"], "source": "responsibledisclosure@mattermost.com"}, {"url": "https://mattermost.com/security-updates", "tags": ["Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "description": [{"lang": "en", "value": "CWE-200"}]}], "descriptions": [{"lang": "en", "value": "Mattermost versions 9.5.x <= 9.5.3, 9.7.x <= 9.7.1 and 8.1.x <= 8.1.12 fail to perform a proper authorization check in the /api/v4/groups/<group-id>/channels/<channel-id>/link endpoint\u00a0which allows a user\u00a0to learn the members of\u00a0an AD/LDAP group that is linked to a team by adding the group to a channel, even if the user has no access to the team."}, {"lang": "es", "value": "Las versiones 9.5.x <= 9.5.3, 9.7.x <= 9.7.1 y 8.1.x <= 8.1.12 de Mattermost no realizan una verificaci\u00f3n de autorizaci\u00f3n adecuada en /api/v4/groups// canales//link endpoint que permite a un usuario conocer los miembros de un grupo AD/LDAP que est\u00e1 vinculado a un equipo agregando el grupo a un canal, incluso si el usuario no tiene acceso al equipo."}], "lastModified": "2025-09-30T15:26:42.900", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "47448305-8E05-4AEE-9E7B-D52AC86C7370", "versionEndExcluding": "8.1.13", "versionStartIncluding": "8.1.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "73F3450F-7A4F-450D-BC68-E726D347636F", "versionEndExcluding": "9.5.4", "versionStartIncluding": "9.5.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "44A14BC6-9CCB-4D0B-9C07-79767507C4D2", "versionEndExcluding": "9.7.2", "versionStartIncluding": "9.7.0"}], "operator": "OR"}]}], "sourceIdentifier": "responsibledisclosure@mattermost.com"}