Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Wed, 19 Aug 2026 13:30:00 +0000
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Mattermost mattermost Server
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| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost mattermost Server
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Tue, 18 Aug 2026 15:30:00 +0000
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| Metrics |
ssvc
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Mon, 17 Aug 2026 23:45:00 +0000
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 17 Aug 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682 | |
| Title | Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite | |
| Weaknesses | CWE-459 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-08-17T22:07:12.958Z
Updated: 2026-08-18T14:21:04.540Z
Reserved: 2026-05-27T10:58:39.051Z
Link: CVE-2026-9693
Updated: 2026-08-18T14:20:59.195Z
Status : Analyzed
Published: 2026-08-17T23:16:52.940
Modified: 2026-08-19T13:14:34.433
Link: CVE-2026-9693
No data.