What’s Vulnerable › Vulnerabilities
CVE-2019-20857
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% 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 5.16.0. It allows attackers to cause a denial of service (markdown renderer hang) via many backtick characters.
Affected products
- Mattermost: before 5.16.0 — fixed in 5.16.0
How to fix
Upgrade to a fixed version: Mattermost 5.16.0. Check the vendor advisory for mitigations.
References
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