What’s Vulnerable › Vulnerabilities
CVE-2023-3582: Lack of channel membership check when linking a board to a channel
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-07-17 · updated 2026-06-17
- Weakness: CWE-863
Description
Mattermost fails to verify channel membership when linking a board to a channel allowing a low-privileged authenticated user to link a Board to a private channel they don't have access to,
Affected products
- Mattermost: from 7.8.0 before 7.8.7; from 7.9.0 before 7.9.5; from 7.10.0 before 7.10.3 — fixed in 7.10.3, 7.8.7, 7.9.5
How to fix
Upgrade to a fixed version: Mattermost 7.10.3, 7.8.7, 7.9.5. Check the vendor advisory for mitigations.
References
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