CVE-2020-7799

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 19.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-01-28 · updated 2026-06-17
Weakness: CWE-917

Description

An issue was discovered in FusionAuth before 1.11.0. An authenticated user, allowed to edit e-mail templates (Home -> Settings -> Email Templates) or themes (Home -> Settings -> Themes), can execute commands on the underlying operating system by abusing freemarker.template.utility.Execute in the Apache FreeMarker engine that processes custom templates.

Affected products

Fusionauth: before 1.11.0 — fixed in 1.11.0

How to fix

Upgrade to a fixed version: Fusionauth 1.11.0. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/156102/FusionAuth-1.10-Remote-Command-Execution.html
https://fusionauth.io/docs/v1/tech/release-notes
https://lab.mediaservice.net/advisory/2020-03-fusionauth.txt
https://seclists.org/bugtraq/2020/Jan/39
http://packetstormsecurity.com/files/156102/FusionAuth-1.10-Remote-Command-Execution.html
https://fusionauth.io/docs/v1/tech/release-notes
https://lab.mediaservice.net/advisory/2020-03-fusionauth.txt
https://seclists.org/bugtraq/2020/Jan/39

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