CVE-2026-5139
5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Summary
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect <instance-name>}} slash command.. Mattermost Advisory ID: MMSA-2026-00644
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.7.0 <= 11.7.0 | affected |
| Mattermost | Mattermost | 11.6.0 <= 11.6.2 | affected |
| Mattermost | Mattermost | 11.5.0 <= 11.5.5 | affected |
| Mattermost | Mattermost | 10.11.0 <= 10.11.17 | affected |
| Mattermost | Mattermost | 11.8.0 | unaffected |
| Mattermost | Mattermost | 11.7.1 | unaffected |
| Mattermost | Mattermost | 11.6.3 | unaffected |
| Mattermost | Mattermost | 11.5.6 | unaffected |
| Mattermost | Mattermost | 10.11.18 | unaffected |
Weaknesses
- CWE-862: CWE-862: Missing Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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