Details of archived public channels are leaked to members of another team
Priority LOW 20CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- 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-284.
Summary
Mattermost fails to properly verify the permissions needed for viewing archived public channels, allowing a member of one team to get details about the archived public channels of another team via the GET /api/v4/teams/<team-id>/channels/deleted endpoint.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 8.1.7, 9.0.5, 9.1.4 +1github.com/mattermost/mattermost-server/v6 (Go): 7.8.10+1 more product
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 9.2.2; up to 9.1.3; up to 9.0.4; up to 8.1.6 | 8.1.7, 9.0.5, 9.1.4, 9.2.3 | Patch available | CNA |
| — | github.com/mattermost/mattermost-server/v6 (Go) | before 7.8.10 | 7.8.10 | Patch available | GHSA-w88v-pjr8-cmv2 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.1.1 | 8.1.1 | Patch available | GHSA-w88v-pjr8-cmv2 |
- Mattermost VendorMattermost Affected up to 9.2.2; up to 9.1.3; up to 9.0.4; up to 8.1.6 Fixed in 8.1.7, 9.0.5, 9.1.4, 9.2.3 Patch available CNA
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 7.8.10 Fixed in 7.8.10 Patch available GHSA-w88v-pjr8-cmv2
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.1.1 Fixed in 8.1.1 Patch available GHSA-w88v-pjr8-cmv2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | before 8.1.7; 9.0.0 to before 9.0.5; 9.1.0 to before 9.1.4; 9.2.0 to before 9.2.3 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 8.1.7; 9.0.0 to before 9.0.5; 9.1.0 to before 9.1.4; 9.2.0 to before 9.2.3 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 8.1.7, 9.0.5, 9.1.4, 9.2.3
- Fix · GHSA-w88v-pjr8-cmv2 github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.8.10 Advisory →
- Fix · GHSA-w88v-pjr8-cmv2 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-47858
- 2026-10-03 Alias added: GHSA-w88v-pjr8-cmv2
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-2023-47858 · CVE Program
- CVE-2023-47858 · NVD
- FIRST EPSS
- GHSA-w88v-pjr8-cmv2 · 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