Uncontrolled resource consumption in Mattermost
Priority LOW 20CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.
Summary
Mattermost versions 8.1.x before 8.1.10, 9.2.x before 9.2.6, 9.3.x before 9.3.2, and 9.4.x before 9.4.3 fail to limit the number of @-mentions processed per message, allowing an authenticated attacker to crash the client applications of other users via large, crafted messages.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00446 39th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 9.5.0, 9.4.3, 9.3.2 +2
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 | 9.4.0 – 9.4.2; 9.3.0 – 9.3.1; 9.2.0 – 9.2.5; 8.1.0 – 8.1.9 | 9.5.0, 9.4.3, 9.3.2, 9.2.6, 8.1.10 | Patch available | CNA |
- Mattermost VendorMattermost Affected 9.4.0 – 9.4.2; 9.3.0 – 9.3.1; 9.2.0 – 9.2.5; 8.1.0 – 8.1.9 Fixed in 9.5.0, 9.4.3, 9.3.2, 9.2.6, 8.1.10 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 8.1.0 to before 8.1.10; 9.2.0 to before 9.2.6; 9.3.0 to before 9.3.2; 9.4.0 to before 9.4.3 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 8.1.0 to before 8.1.10; 9.2.0 to before 9.2.6; 9.3.0 to before 9.3.2; 9.4.0 to before 9.4.3 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 9.5.0, 9.4.3, 9.3.2, 9.2.6, 8.1.10
Timeline
- 2026-10-02 Threatist record created from CVE-2024-2446
- 2026-10-03 Alias added: GHSA-x6jw-w885-qwpc
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-2024-2446 · CVE Program
- CVE-2024-2446 · NVD
- FIRST EPSS
- GHSA-x6jw-w885-qwpc · 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