Permalink previews displayed for posts in archived channels even if users are disallowed to view archived channels
Priority LOW 21CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- 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
Mattermost fails to check whether the “Allow users to view archived channels” setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled.
Why it matters now
EPSS 0.00506 43rd percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 9.0.2, 9.1.1, 7.8.13 +1github.com/mattermost/mattermost/server/v8 (Go): 9.1.1, 9.0.2, 8.1.4+1 more product
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | up to 7.8.12; up to 8.1.3; up to 9.0.1; up to 9.1.0 | 9.0.2, 9.1.1, 7.8.13, 8.1.4 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.1.0 to before 9.1.1 | 9.1.1 | Patch available | GHSA-jjr7-372r-cx7x |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.0.0 to before 9.0.2 | 9.0.2 | Patch available | GHSA-jjr7-372r-cx7x |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.1.4 | 8.1.4 | Patch available | GHSA-jjr7-372r-cx7x |
| — | github.com/mattermost/mattermost-server/v6 (Go) | before 7.8.13 | 7.8.13 | Patch available | GHSA-jjr7-372r-cx7x |
- Mattermost VendorMattermost Affected up to 7.8.12; up to 8.1.3; up to 9.0.1; up to 9.1.0 Fixed in 9.0.2, 9.1.1, 7.8.13, 8.1.4 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.1.0 to before 9.1.1 Fixed in 9.1.1 Patch available GHSA-jjr7-372r-cx7x
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0 to before 9.0.2 Fixed in 9.0.2 Patch available GHSA-jjr7-372r-cx7x
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.1.4 Fixed in 8.1.4 Patch available GHSA-jjr7-372r-cx7x
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 7.8.13 Fixed in 7.8.13 Patch available GHSA-jjr7-372r-cx7x
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* | up to 7.8.12; 8.0.0 – 8.1.3; 9.0.0 – 9.0.1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost:9.1.0:*:*:*:*:*:*:* | 9.1.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* Versions up to 7.8.12; 8.0.0 – 8.1.3; 9.0.0 – 9.0.1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost:9.1.0:*:*:*:*:*:*:* Versions 9.1.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 9.0.2, 9.1.1, 7.8.13, 8.1.4
- Fix · GHSA-jjr7-372r-cx7x github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.1.1 Advisory →
- Fix · GHSA-jjr7-372r-cx7x github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.0.2 Advisory →
- Fix · GHSA-jjr7-372r-cx7x github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.1.4 Advisory →
- Fix · GHSA-jjr7-372r-cx7x github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.8.13 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-43754
- 2026-10-03 Alias added: GHSA-jjr7-372r-cx7x
References
More Mattermost vulnerabilities
- TI-2024-26695 Malicious remote can invite itself to an arbitrary local channel CVSS 3.1CRITICAL 9.6
- TI-2023-02056 Oauth authorization codes do not expire when deauthorizing an oauth2 app CVSS 3.1CRITICAL 9.1
- TI-2019-15069 An issue was discovered in Mattermost Mobile Apps before 1.26.0. CVSS 3.1CRITICAL 9.1
- TI-2024-26233 Malicious remote can add users to arbitrary teams and channels CVSS 3.1HIGH 8.7
- TI-2024-26746 Permanently local data deletion by malicious remote CVSS 3.1HIGH 8.7
- TI-2023-06508 Injection in Mattermost CVSS 3.1HIGH 8.8
Sources
- CVE-2023-43754 · CVE Program
- CVE-2023-43754 · NVD
- FIRST EPSS
- GHSA-jjr7-372r-cx7x · 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