css-interop-observer-polyfill

{"modified":"2026-10-04T23:14:35Z","published":"2026-10-04T23:14:35Z","schema_version":"1.7.4","id":"MAL-2026-17480","summary":"Malicious code in css-interop-observer-polyfill (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (089bdc1dd6bdf0216bb911888e81ce97dc171bdef2588fd5de0aadb4a64fbb2b)\nOn module load, thunderboltRegistry.js executes an IIFE that runs id, whoami, uname, ifconfig/ip addr via child_process.execSync and reads /etc/hosts, then sends each result together with hostname, node version, platform and pid to the hardcoded endpoint http://dxpoc.gt.tc/callback.php/[token] via fetch over plain HTTP. The package presents itself as a stub exporting proxies for Wix thunderbolt internal registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.), consistent with dependency-confusion targeting of those internal module names while the load-time code performs the host reconnaissance and exfiltration.\n","affected":[{"package":{"ecosystem":"npm","name":"css-interop-observer-polyfill"},"versions":["1.0.0"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"thunderboltRegistry.js","sha256":"a485cb48081ea590cab385a405886cfe6f30af7d415f30bc8d7937ace461b928","tlsh":"e87154a5b99df02065c33438cb7f4049b4bbc6672d6caee0744899b01f7985c01be6f8"}],"package_integrity":[{"filename":"css-interop-observer-polyfill-1.0.0.tgz","hashes":{"sha1":"63dead8d935e06fe33f87854159c94b69732535a","sha512_sri":"sha512-YtPFUAGh6fatFhfwC2LTA6tFw/3CjUvJnkm88PTgiWx88qPl6DitXPiRlGKd5nRdM/CoWldJUsMlU5l3APYsKQ=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/css-interop-observer-polyfill/v/1.0.0"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-020888","import_time":"2026-10-04T23:16:30.534739806Z","modified_time":"2026-10-04T23:14:35Z","sha256":"089bdc1dd6bdf0216bb911888e81ce97dc171bdef2588fd5de0aadb4a64fbb2b","source":"amazon-inspector","versions":["1.0.0"]}]}}