CVE-2023-4478
highpriority · track · 33EPSS 0.005 · 43 %ileDEEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–8.2
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
- mattermost mattermost server7.9.0 → 7.10.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2023-1892Mattermost: Schwachstelle ermöglicht Denial of ServiceDeutsch2023-07-26csaf · cert_bundDE
Ein Angreifer kann eine Schwachstelle in Mattermost ausnutzen, um einen Denial of Service zu verursachen.
- BIT-mattermost-2023-44782024-03-06vendor · osvUS
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.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan