What’s Vulnerable › Vulnerabilities

CVE-2019-20890

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% 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 5.7. It allows a bypass of e-mail address discovery restrictions.

Affected products

• Mattermost: before 5.7.0 — fixed in 5.7.0

How to fix

Upgrade to a fixed version: Mattermost 5.7.0. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates/
• https://mattermost.com/security-updates/

Get alerted when CVE-2019-20890 or the next vulnerability affects your stack