No advisories yet.
Solution
Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5, 10.11.20 or higher.
Workaround
No workaround given by the vendor.
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
|
Mon, 13 Jul 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 13 Jul 2026 09:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
|
| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 13 Jul 2026 08:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 | |
| Title | Incoming webhook user attribution via unvalidated webhook owner | |
| Weaknesses | CWE-639 | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-07-13T14:45:16.207Z
Reserved: 2026-05-27T13:46:27.399Z
Link: CVE-2026-9708
Updated: 2026-07-13T14:44:59.987Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-13T17:30:04Z