cs-core-api-phoenixnpm
Advisory published Updated
cs-core-api-phoenix is a confirmed malicious npm package (MAL-2026-18686) that executes malicious code on install (malicious version 5.1.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in cs-core-api-phoenix (npm)
What this malware does
cs-core-api-phoenix 5.1.0 is a dependency-confusion package: its postinstall script reads the OS user name and hostname and POSTs them to https://nathanaccacio.com/collect on every install. It targets an internal-looking name and collects data from whoever installs it, without consent.
Malicious versions
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for cs-core-api-phoenix (version 5.1.0).
If you installed it — respond
Remove cs-core-api-phoenix from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If cs-core-api-phoenix 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
References
Credits
- CyberXYZ · finder
Detect & block this
O3 blocks cs-core-api-phoenix-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.