Unauthorized View Access to Archived Channel Member Info
Priority LOW 20CWE-863Published · 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-863.
Summary
Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to properly enforce the 'Allow users to view/update archived channels' System Console setting, which allows authenticated users to view members and member information of archived channels even when this setting is disabled.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.6.0, 10.5.2, 10.4.4 +1github.com/mattermost/mattermost/server/v8 (Go): 10.5.2, 10.4.4, 9.11.10 +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 | 10.5.0 – 10.5.1; 10.4.0 – 10.4.3; 9.11.0 – 9.11.9 | 10.6.0, 10.5.2, 10.4.4, 9.11.10 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.5.0 to before 10.5.2 | 10.5.2 | Patch available | GHSA-mj2p-v2c2-vh4v |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.4.0 to before 10.4.4 | 10.4.4 | Patch available | GHSA-mj2p-v2c2-vh4v |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.11.0 to before 9.11.10 | 9.11.10 | Patch available | GHSA-mj2p-v2c2-vh4v |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250314142426-c049748b8863 | 8.0.0-20250314142426-c049748b8863 | Patch available | GHSA-mj2p-v2c2-vh4v |
- Mattermost VendorMattermost Affected 10.5.0 – 10.5.1; 10.4.0 – 10.4.3; 9.11.0 – 9.11.9 Fixed in 10.6.0, 10.5.2, 10.4.4, 9.11.10 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 to before 10.5.2 Fixed in 10.5.2 Patch available GHSA-mj2p-v2c2-vh4v
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.4.0 to before 10.4.4 Fixed in 10.4.4 Patch available GHSA-mj2p-v2c2-vh4v
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 to before 9.11.10 Fixed in 9.11.10 Patch available GHSA-mj2p-v2c2-vh4v
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250314142426-c049748b8863 Fixed in 8.0.0-20250314142426-c049748b8863 Patch available GHSA-mj2p-v2c2-vh4v
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.10; 10.4.0 to before 10.4.4; 10.5.0 to before 10.5.2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.10; 10.4.0 to before 10.4.4; 10.5.0 to before 10.5.2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.6.0, 10.5.2, 10.4.4, 9.11.10
- Fix · GHSA-mj2p-v2c2-vh4v github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.2 Advisory →
- Fix · GHSA-mj2p-v2c2-vh4v github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.4.4 Advisory →
- Fix · GHSA-mj2p-v2c2-vh4v github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.10 Advisory →
- Fix · GHSA-mj2p-v2c2-vh4v github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250314142426-c049748b8863 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-2564
- 2026-10-03 Alias added: GHSA-mj2p-v2c2-vh4v
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-2025-2564 · CVE Program
- CVE-2025-2564 · NVD
- FIRST EPSS
- GHSA-mj2p-v2c2-vh4v · GitHub Advisory Database · CC BY 4.0
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