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Vulnerability record · CVE-2020-7799 · published 28 January 2020

CVE-2020-7799: Fusionauth expression language injection vulnerability

Fusionauth · Fusionauth

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.

7.2 CVSS 3.1 High EPSS 20% · top 2.7% CWE-917 · Expression language injection
7.2CVSS 3.1 base score, v2 9.0
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/156102/FusionAuth-1.10-Remote-Command-Execution.html Third Party AdvisoryVDB Entry
https://fusionauth.io/docs/v1/tech/release-notes ExploitRelease NotesVendor Advisory
https://lab.mediaservice.net/advisory/2020-03-fusionauth.txt Third Party Advisory
https://seclists.org/bugtraq/2020/Jan/39 Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/156102/FusionAuth-1.10-Remote-Command-Execution.html Third Party AdvisoryVDB Entry
https://fusionauth.io/docs/v1/tech/release-notes ExploitRelease NotesVendor Advisory
https://lab.mediaservice.net/advisory/2020-03-fusionauth.txt Third Party Advisory
https://seclists.org/bugtraq/2020/Jan/39 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-7799), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.