What’s Vulnerable › Vulnerabilities
CVE-2019-20877
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-06-19 · updated 2026-06-17
Description
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. It allows attackers to obtain sensitive information about whether someone has 2FA enabled.
Affected products
- Mattermost: before 4.10.8; from 5.7.0 before 5.7.3; from 5.8.0 before 5.8.1; 5.9.0-rc1, 5.9.0-rc2, 5.9.0-rc3, 5.9.0-rc4 — fixed in 4.10.8, 5.7.3, 5.8.1
How to fix
Upgrade to a fixed version: Mattermost 4.10.8, 5.7.3, 5.8.1. Check the vendor advisory for mitigations.
References
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