CVE-2020-11056Public exploitNetwork attack vector

Server code execution via rerendered form fields

Published May 7, 2020 · Updated Aug 4, 2024

Server-side template injection in Barrel Strength Design Sprout Forms before 3.9.0 allows attackers to execute Twig code. The Mailer component passes an email body containing user-controlled form values to Craft's renderObjectTemplate function, which evaluates embedded Twig expressions. Reachability requires a notification template that displays form fields; successful payloads can read configuration data or execute server-side commands.

CVSS severity7.4
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in Barrel Strength Design Sprout Forms before 3.9.0 allows attackers to execute Twig code. The Mailer component passes an email body containing user-controlled form values to Craft's renderObjectTemplate function, which evaluates embedded Twig expressions. Reachability requires a notification template that displays form fields; successful payloads can read configuration data or execute server-side commands.

The record

CVE
CVE-2020-11056
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
Barrel Strength Design
Product
Sprout Forms
Classifications
CWE-74, CWE-94, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Barrel Strength Design · Sprout Formsversion=< 3.9.0

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.4GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
6.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059.004Unix Shell

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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