title: Parameter tampering in the registration resulting in blocked accounts to be created
description: Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts.
problem types: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
affected:
{
defaultStatus: unaffected
product: Mattermost
vendor: Mattermost
versions:
lessThanOrEqual: 7.8.8, status: affected, version: 0, versionType: semver
lessThanOrEqual: 7.10.4, status: affected, version: 0, versionType: semver
status: unaffected, version: 7.8.9
status: unaffected, version: 7.10.5
status: unaffected, version: 8.0.1
status: affected, version: 8.0.0
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: Update Mattermost Server to versions 7.8.9, 7.10.5, 8.0.1 or higher.