CVE-2020-13423: Form Builder 2.1.0 for Magento has multiple XSS issues that can be exploited against Magento 2 admin accounts

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MEDIUM 4.8DOWNGRADE

CVE-2020-13423 is a medium-severity flaw (CVSS 4.8) affecting form builder for magento 2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Form Builder 2.1.0 for Magento has multiple XSS issues that can be exploited against Magento 2 admin accounts via the Current_url or email field, or the User-Agent HTTP header.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-06-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: form builder for magento 2 project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-29 14:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

form builder for magento 2 project form builder for magento 2 DOWNGRADE

Affected: 2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

apt-cache policy form-builder-for-magento-2 || rpm -q form-builder-for-magento-2 || form-builder-for-magento-2 --version

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison form-builder-for-magento-2 sudo apt install form-builder-for-magento-2=<VERSION_BEFORE_2.1.0> sudo apt-mark hold form-builder-for-magento-2

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list form-builder-for-magento-2 sudo dnf downgrade form-builder-for-magento-2-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add form-builder-for-magento-2

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-13423?

form builder for magento 2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13423 being exploited?

CVE-2020-13423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-13423 affect?

CVE-2020-13423 affects form builder for magento 2. Severity is medium (CVSS 4.8). Form Builder 2.1.0 for Magento has multiple XSS issues that can be exploited against Magento 2 admin accounts via the Current_url or email field, or the User-Agent HTTP header.

How urgent is CVE-2020-13423?

Priority 40/100. Public exploit reference

Software pages

Magento vulnerabilities

References

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