What’s Vulnerable › Vulnerabilities
CVE-2018-21260
- Severity: low (CVSS 2.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-06-19 · updated 2026-06-17
- Weakness: CWE-200
Description
An issue was discovered in Mattermost Server before 4.8.1, 4.7.4, and 4.6.3. WebSocket events were accidentally sent during certain user-management operations, violating user privacy.
Affected products
- Mattermost: from 4.6.0 before 4.6.3; from 4.7.0 before 4.7.4; from 4.8.0 before 4.8.1 — fixed in 4.6.3, 4.7.4, 4.8.1
How to fix
Upgrade to a fixed version: Mattermost 4.6.3, 4.7.4, 4.8.1. Check the vendor advisory for mitigations.
References
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