title: Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
description: Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.
problem types: CWE-284: Improper Access Control
affected:
{
defaultStatus: unaffected
product: Mattermost
vendor: Mattermost
versions:
lessThanOrEqual: 7.8.12, status: affected, version: 0, versionType: semver
lessThanOrEqual: 8.1.3, status: affected, version: 0, versionType: semver
lessThanOrEqual: 9.0.1, status: affected, version: 0, versionType: semver
lessThanOrEqual: 9.1.0, status: affected, version: 0, versionType: semver
status: unaffected, version: 9.0.2
status: unaffected, version: 9.1.1
status: unaffected, version: 7.8.13
status: unaffected, version: 8.1.4
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: Update Mattermost Server to versions 9.0.2, 9.1.1, 7.8.13, 8.1.4 or higher.