title:  Denial of Service via multiple identical User IDs in /api/v4/users/ids
description: Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identical IDs.
problem types: CWE-400 Uncontrolled Resource Consumption
affected:
{
defaultStatus: unaffected
product: Mattermost
vendor: Mattermost
versions:
lessThanOrEqual: 7.8.10, status: affected, version: 0, versionType: semver
lessThanOrEqual: 8.0.2, status: affected, version: 0, versionType: semver
lessThanOrEqual: 8.1.1, status: affected, version: 0, versionType: semver
status: unaffected, version: 7.8.11
status: unaffected, version: 8.0.3
status: unaffected, version: 8.1.2
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: Update Mattermost Server to versions 7.8.11, 8.0.3, 8.1.2 or higher.