Information disclosure in Mattermost
Priority LOW 13CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
A race condition in Mattermost versions 8.1.x before 8.1.9, and 9.4.x before 9.4.2 allows an authenticated attacker to gain unauthorized access to individual posts' contents via carefully timed post creation while another user deletes posts.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00266 18th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 9.5, 9.4.2, 8.1.9github.com/mattermost/mattermost/server/v8 (Go): 9.4.2, 8.1.9
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 | 8.1.0 – 8.1.8; 9.4.0 – 9.4.1 | 9.5, 9.4.2, 8.1.9 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.0.0 to before 9.4.2 | 9.4.2 | Patch available | GHSA-3g35-v53r-gpxc |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.1.9 | 8.1.9 | Patch available | GHSA-3g35-v53r-gpxc |
- Mattermost VendorMattermost Affected 8.1.0 – 8.1.8; 9.4.0 – 9.4.1 Fixed in 9.5, 9.4.2, 8.1.9 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0 to before 9.4.2 Fixed in 9.4.2 Patch available GHSA-3g35-v53r-gpxc
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.1.9 Fixed in 8.1.9 Patch available GHSA-3g35-v53r-gpxc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 8.1.0 to before 8.1.9; 9.4.0 to before 9.4.2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 8.1.0 to before 8.1.9; 9.4.0 to before 9.4.2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 9.5, 9.4.2, 8.1.9
- Fix · GHSA-3g35-v53r-gpxc github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.4.2 Advisory →
- Fix · GHSA-3g35-v53r-gpxc github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.9 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-1949
- 2026-10-03 Alias added: GHSA-3g35-v53r-gpxc
References
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-2024-1949 · CVE Program
- CVE-2024-1949 · NVD
- FIRST EPSS
- GHSA-3g35-v53r-gpxc · GitHub Advisory Database · CC BY 4.0
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