What’s Vulnerable › Vulnerabilities

CVE-2019-20865

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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-352

Description

An issue was discovered in Mattermost Server before 5.12.0, 5.11.1, 5.10.2, 5.9.2, and 4.10.10. The login page allows CSRF.

Affected products

• Mattermost: before 4.10.10; from 5.9.0 before 5.9.2; from 5.10.0 before 5.10.2; from 5.11.0 before 5.11.1; 5.12.0-rc1, 5.12.0-rc2, 5.12.0-rc3, 5.12.0-rc4, 5.12.0-rc5, 5.12.0-rc6 — fixed in 4.10.10, 5.10.2, 5.11.1, 5.9.2

How to fix

Upgrade to a fixed version: Mattermost 4.10.10, 5.10.2, 5.11.1, 5.9.2. Check the vendor advisory for mitigations.

References

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

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