my-cdn-scriptnpm
Advisory published Updated
my-cdn-script is a confirmed malicious npm package (MAL-2026-16337) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in my-cdn-script (npm)
What this malware does
[email protected] ships a client-side payment-card skimmer in script.js. When loaded on a checkout page, the script injects a fake card-input form into the Alpha Bank hosted payment method and captures the card number, expiry, CVC together with the shopper's name, address, city, region, postcode, phone, and page origin. The concatenated payload is encoded byte-by-byte, wrapped in a Blob with type 'image/png' to disguise it as an image upload, and POSTed to the hardcoded attacker endpoint https://ungpkg.top/gate. The script uses uniform bracket-notation property access to defeat static string scans, sets a sessionStorage flag to avoid re-sending, and gates itself off when admin-panel cookies/localStorage keys (psAdminLang, psAdminTab, psAdminTheme, _ga_8F4XM9P3R51) are present so a merchant testing their own checkout does not observe the theft. Any site that includes this package on its checkout page will have its customers' payment card data and PII silently harvested and sent to ungpkg.top.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for my-cdn-script (version 1.0.0).
If you installed it — respond
my-cdn-script is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If my-cdn-script was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks my-cdn-script-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.