CVE-2026-9693
Low
No strong exploitation signal.
CVSS base
3.5
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
EPSS — probability of exploitation (30 days)
0.2%
5.5th percentile
CISA KEV
Not listed
Weakness / dates
CWE-459
Published 2026-08-17 · modified 2026-08-19
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | L | Low |
| User Interaction | R | Required |
| Scope | U | Unchanged |
| Confidentiality | L | Low |
| Integrity | N | None |
| Availability | N | None |
Timeline
- 2026-08-17 — Published (NVD)
- 2026-08-19 — Last modified (NVD)
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