CVE-2020-8818: An issue was discovered in the CardGate Payments plugin through 2.0.30 for Magento 2

This month

HIGH 8.1UPGRADEDOWNGRADE

CVE-2020-8818 is a high-severity flaw (CVSS 8.1) affecting cardgate payments, magento. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the CardGate Payments plugin through 2.0.30 for Magento 2. Lack of origin authentication in the IPN callback processing function in Controller/Payment/Callback.php allows an attacker to remotely replace critical plugin settings (merchant ID, secret key, etc.) and therefore bypass the payment process (e.g., spoof an order status by manually sending an IPN callback request with a valid signature but without real payment)

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-346
Published	2020-02-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: adobe · cardgate

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

Am I affected?

Timeline

2020-02-25 02:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

cardgate cardgate payments UPGRADE

Affected: <= 2.0.30

Fixed in: newer than 2.0.30

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cardgate-payments || rpm -q cardgate-payments || cardgate-payments --version

2. UPGRADE to newer than 2.0.30 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cardgate-payments

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cardgate-payments

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

adobe magento DOWNGRADE

Affected: 2.3.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.4

1. Check installed version

apt-cache policy magento || rpm -q magento || magento --version

2. No fixed release: DOWNGRADE to a release before 2.3.4 (Debian / Ubuntu)

apt-cache madison magento sudo apt install magento=<VERSION_BEFORE_2.3.4> sudo apt-mark hold magento

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

dnf --showduplicates list magento sudo dnf downgrade magento-<VERSION_BEFORE_2.3.4> sudo dnf versionlock add magento

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-2020-8818?

cardgate payments: upgrade to newer than 2.0.30; magento: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-8818 being exploited?

CVE-2020-8818 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-2020-8818 affect?

CVE-2020-8818 affects cardgate payments, magento. Severity is high (CVSS 8.1). An issue was discovered in the CardGate Payments plugin through 2.0.30 for Magento 2. Lack of origin authentication in the IPN callback processing function in Controller/Payment/Callback.php allows an attacker to remotely replace critical p

How urgent is CVE-2020-8818?

Priority 56/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities · Magento vulnerabilities

Related CVEs

CVE-2020-8819 HIGH 8.1 UPGRADE An issue was discovered in the CardGate Payments plugin through 3.1.15 for WooCommerce

References

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