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MEDIUM severity

Improper Certificate Validation in Heartland & Global Payments PHP SDKGHSA-pm77-c4q7-3fwj

MEDIUMFix: globalpayments/php-sdk#8

GHSA-pm77-c4q7-3fwj is a medium-severity (CVSS 5.9) CWE-295 vulnerability in globalpayments/php-sdk. 2 public exploit references exist, so weaponization risk is real. A fix is available for globalpayments/php-sdk — see the affected versions and patch details below.

Also known asCVE-2019-20455
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.49%0.98%1.48%0.4%1.0%1.0%1.0%1.0%Jun 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-pm77-c4q7-3fwj by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘globalpayments/php-sdk

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Gateways/Gateway.php in Heartland & Global Payments PHP SDK before 2.0.0 does not enforce SSL certificate validations.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistglobalpayments/php-sdkall versions2.0.0composer require globalpayments/php-sdk:^2.0.0

Affected Products

1 product · 1 configurations
Application
php sdkglobalpayments
< 2.0.0
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Gateways/Gateway.php in Heartland & Global Payments PHP SDK before 2.0.0…

winterdragon.caNVDFeb 2020

Gateways/Gateway.php in Heartland & Global Payments PHP SDK before 2.0.0…

github.comNVDNov 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for globalpayments/php-sdk, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update globalpayments/php-sdk to 2.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pm77-c4q7-3fwj is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Gateways/Gateway.php in Heartland & Global Payments PHP SDK before 2.0.0 does not enforce SSL certificate validations.
O3 Security · Impact-Aware SCA

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