CVE-2026-20796
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Summary
Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 10.11.0 <= 10.11.9 | affected |
| Mattermost | Mattermost | 11.3.0 | unaffected |
| Mattermost | Mattermost | 10.11.10 | unaffected |
Weaknesses
- CWE-367: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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