What’s Vulnerable › Vulnerabilities

CVE-2019-20879

• Severity: medium (CVSS 4.3 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: 2020-06-19 · updated 2026-06-17
• Weakness: CWE-287

Description

An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. Changes to e-mail addresses do not require credential re-entry.

Affected products

• Mattermost: before 4.10.7; from 5.6.0 before 5.6.5; from 5.7.0 before 5.7.2; 5.8.0-rc1, 5.8.0-rc2, 5.8.0-rc3, 5.8.0-rc4 — fixed in 4.10.7, 5.6.5, 5.7.2

How to fix

Upgrade to a fixed version: Mattermost 4.10.7, 5.6.5, 5.7.2. Check the vendor advisory for mitigations.

References

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

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