CVE-2026-9708
4.9
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.7.0 <= 11.7.2 | affected |
| Mattermost | Mattermost | 11.6.0 <= 11.6.4 | affected |
| Mattermost | Mattermost | 10.11.0 <= 10.11.19 | affected |
| Mattermost | Mattermost | 11.8.0 | unaffected |
| Mattermost | Mattermost | 11.7.3 | unaffected |
| Mattermost | Mattermost | 11.6.5 | unaffected |
| Mattermost | Mattermost | 10.11.20 | unaffected |
Weaknesses
- CWE-639: CWE-639: Authorization Bypass Through User-Controlled Key
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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