Parameter tampering in the registration resulting in blocked accounts to be created
Priority LOW 36CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00504 43rd percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 7.8.9, 7.10.5, 8.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | up to 7.8.8; up to 7.10.4; 8.0.0 | 7.8.9, 7.10.5, 8.0.1 | Patch available | CNA |
- Mattermost VendorMattermost Affected up to 7.8.8; up to 7.10.4; 8.0.0 Fixed in 7.8.9, 7.10.5, 8.0.1 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | before 7.8.9; 7.9.0 to before 7.10.5 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:8.0.0:*:*:*:*:*:*:* | 8.0.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 7.8.9; 7.9.0 to before 7.10.5 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:8.0.0:*:*:*:*:*:*:* Versions 8.0.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 7.8.9, 7.10.5, 8.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2023-4478
- 2026-10-03 Alias added: GHSA-65h8-5q72-mrp3
References
Advisory 1
More Mattermost Server vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
- TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
- TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
- TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
Sources
- CVE-2023-4478 · CVE Program
- CVE-2023-4478 · NVD
- FIRST EPSS
- GHSA-65h8-5q72-mrp3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences