What’s Vulnerable › Vulnerabilities
CVE-2021-37864: Users can view the contents of an archived channel when access is explicitly denied by the system admin
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-01-18 · updated 2026-06-17
- Weakness: CWE-284
Description
Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.
Affected products
- Mattermost App Framework: through 6.1
References
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