Channel metadata visible in archived channels despite configuration setting
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 check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00273 19th 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-h4rr-f37j-4hh7 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.4.0 to before 10.4.4 | 10.4.4 | Patch available | GHSA-h4rr-f37j-4hh7 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.11.0 to before 9.11.10 | 9.11.10 | Patch available | GHSA-h4rr-f37j-4hh7 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250314142426-c049748b8863 | 8.0.0-20250314142426-c049748b8863 | Patch available | GHSA-h4rr-f37j-4hh7 |
- 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-h4rr-f37j-4hh7
- 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-h4rr-f37j-4hh7
- 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-h4rr-f37j-4hh7
- 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-h4rr-f37j-4hh7
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-h4rr-f37j-4hh7 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.2 Advisory →
- Fix · GHSA-h4rr-f37j-4hh7 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.4.4 Advisory →
- Fix · GHSA-h4rr-f37j-4hh7 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.10 Advisory →
- Fix · GHSA-h4rr-f37j-4hh7 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250314142426-c049748b8863 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-27571
- 2026-10-03 Alias added: GHSA-h4rr-f37j-4hh7
References
Other 7
- https://github.com/mattermost/mattermost/commit/341186355d982ac4cbe37668d7cdb0cf6275fe44
- https://github.com/mattermost/mattermost/commit/629f68a85dd6ed5ba0c51a9356c3a3200f50657f
- https://github.com/mattermost/mattermost/commit/8e82d8df61068fc56b0f3e51ef1cc947bc87cec1
- https://github.com/mattermost/mattermost/commit/ae8a952bcaaa5f77a92043e2538f625eac72e927
- https://github.com/mattermost/mattermost/commit/c6f6b664811795f36b9cf05b0e2b537c44c65bc1
- https://github.com/mattermost/mattermost
- https://pkg.go.dev/vuln/GO-2025-3619
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-2025-27571 · CVE Program
- CVE-2025-27571 · NVD
- FIRST EPSS
- GHSA-h4rr-f37j-4hh7 · GitHub Advisory Database · CC BY 4.0
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