CVE-2020-7799Public exploitNetwork attack vector

Authenticated command execution via FreeMarker Execute utility

Published Jan 28, 2020 · Updated Aug 4, 2024

Expression language injection in FusionAuth before 1.11.0 allows remote authenticated users to execute operating-system commands. The email-template preview and theme processors evaluate attacker-controlled FreeMarker expressions that instantiate freemarker.template.utility.Execute and pass an operating-system command to it. Access to edit email templates or themes is required, and successful exploitation runs commands with the FusionAuth service account's operating-system privileges.

CVSS severity7.2
High
EPSS probability19.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expression language injection in FusionAuth before 1.11.0 allows remote authenticated users to execute operating-system commands. The email-template preview and theme processors evaluate attacker-controlled FreeMarker expressions that instantiate freemarker.template.utility.Execute and pass an operating-system command to it. Access to edit email templates or themes is required, and successful exploitation runs commands with the FusionAuth service account's operating-system privileges.

The record

CVE
CVE-2020-7799
Published
Jan 28, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-917, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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