App Framework does not checks for the secret provided in the incoming webhook request
Priority LOW 20CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
Mattermost Apps Framework fails to verify that a secret provided in the incoming webhook request allowing an attacker to modify the contents of the post sent by the Apps.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00437 38th percentileScored 2026-11-07
Fix Fixed Mattermost App Framework (Mattermost): 7.10.1, 7.8.5, 7.9.4github.com/mattermost/mattermost-server/v6 (Go): 7.10.1, 7.9.4, 7.8.5 +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 App Framework | up to 7.8.4; up to 7.9.3; 7.10.0 | 7.10.1, 7.8.5, 7.9.4 | Patch available | CNA |
| — | github.com/mattermost/mattermost-server/v6 (Go) | 7.10.0 to before 7.10.1 | 7.10.1 | Patch available | GHSA-455c-vqrf-mghr |
| — | github.com/mattermost/mattermost-server/v6 (Go) | 7.9.0 to before 7.9.4 | 7.9.4 | Patch available | GHSA-455c-vqrf-mghr |
| — | github.com/mattermost/mattermost-server/v6 (Go) | 6.0.0 to before 7.8.5 | 7.8.5 | Patch available | GHSA-455c-vqrf-mghr |
| — | github.com/mattermost/mattermost-server/v6 (Go) | before 6.0.0-20230511130429-1629a6ca7fed | 6.0.0-20230511130429-1629a6ca7fed | Patch available | GHSA-455c-vqrf-mghr |
- Mattermost App Framework VendorMattermost Affected up to 7.8.4; up to 7.9.3; 7.10.0 Fixed in 7.10.1, 7.8.5, 7.9.4 Patch available CNA
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected 7.10.0 to before 7.10.1 Fixed in 7.10.1 Patch available GHSA-455c-vqrf-mghr
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected 7.9.0 to before 7.9.4 Fixed in 7.9.4 Patch available GHSA-455c-vqrf-mghr
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected 6.0.0 to before 7.8.5 Fixed in 7.8.5 Patch available GHSA-455c-vqrf-mghr
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 6.0.0-20230511130429-1629a6ca7fed Fixed in 6.0.0-20230511130429-1629a6ca7fed Patch available GHSA-455c-vqrf-mghr
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* | 7.8.0 – 7.8.4; 7.9.0 – 7.9.3 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost:7.10.0:*:*:*:*:*:*:* | 7.10.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:* Versions 7.8.0 – 7.8.4; 7.9.0 – 7.9.3 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost:7.10.0:*:*:*:*:*:*:* Versions 7.10.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost App Framework (Mattermost) Fixed in 7.10.1, 7.8.5, 7.9.4
- Fix · GHSA-455c-vqrf-mghr github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.10.1 Advisory →
- Fix · GHSA-455c-vqrf-mghr github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.9.4 Advisory →
- Fix · GHSA-455c-vqrf-mghr github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.8.5 Advisory →
- Fix · GHSA-455c-vqrf-mghr github.com/mattermost/mattermost-server/v6 (Go) Fixed in 6.0.0-20230511130429-1629a6ca7fed Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-2783
- 2026-10-03 Alias added: GHSA-455c-vqrf-mghr
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-2023-2783 · CVE Program
- CVE-2023-2783 · NVD
- FIRST EPSS
- GHSA-455c-vqrf-mghr · 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