@itsreduxtm/unpkg-xss-testnpm
Advisory published Updated
@itsreduxtm/unpkg-xss-test is a confirmed malicious npm package (MAL-2026-13431) that executes malicious code on install (malicious versions 1.0.5, 1.0.9). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @itsreduxtm/unpkg-xss-test (npm)
What this malware does
payload.js is declared as the package main and runs an IIFE immediately on require/import. It fetches a wordlist of Linux binary names from https://unpkg.com/@itsreduxtm/[email protected]/binlist.txt and issues concurrent HEAD requests to https://entretienextremejb.ca/bin/<name> for each entry, sourcing the traffic from the installer's machine and IP address. The package name (unpkg-xss-test) and GTFOBins-style wordlist shape indicate this is a browser XSS-delivered path-enumeration payload; when loaded in Node (fetch is global in Node 18+), the installer conducts the scan against a third party. This covertly weaponizes the installer's identity for reconnaissance against an unrelated site, exposing the installer to abuse reports, IP blocklisting, and potential legal complaints for unauthorized scanning.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for @itsreduxtm/unpkg-xss-test (2 malicious versions).
If you installed it — respond
Remove @itsreduxtm/unpkg-xss-test 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 @itsreduxtm/unpkg-xss-test 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 @itsreduxtm/unpkg-xss-test-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.