Malicious code in radio-player-theme (npm)

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

`radio-player-theme` presents itself as a radio player theme. The published tarball contains three files: `package.json`, `style.css` (declared as `main`) and `payload.js`, which holds the package's only executable code. `payload.js` is a browser payload. On execution it reads `location.origin` and `document.cookie`, extracts the value of a `MANAGER-XSRF-TOKEN` cookie, and sends the origin together with the collected state to an out-of-band callback domain under `oastify.com` by assigning it to an `Image.src`. It then issues a second authenticated request to a third-party manager API and writes the collected data to `window.__radioXssProof`. The file carries a comment describing itself as a bug bounty proof of concept for a CSP bypass through a public CDN that serves npm packages. Regardless of that claim, the published package delivers working data-collection code to anyone who loads it, and the package has no other function. The package declares no install hooks, so `npm install` alone does not execute the payload; the code runs when the file is loaded in a browser, which is what CDN delivery of an npm package enables. Evidence: `payload.js:7` holds the hardcoded callback domain; `payload.js:13-19` perform the cookie read and the beacons. Determination: manual review of the published tarball (sha256 `ddbb93aa9416c1c89cf15dc7627f4a816a1c31929238ed8608264546ba0df186`). --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (6d9e0f0ee96d95fb59c2b3cfb30cfad6e32db8112eab806c63eda8f703e43d12) [email protected] ships static browser assets (payload.js and a CSS file) whose content is a proof-of-concept CSS/XSS injection chain targeting a third-party service (manager.infomaniak.com), exfiltrating an origin string and an XSRF cookie preview to an Interactsh collaborator subdomain under oastify.com. The package declares no npm lifecycle scripts (preinstall/install/postinstall/prepare) and its main entry points at style.css, so nothing runs on npm install or on require(). The payload only has effect if the CSS/JS is loaded inside a victim's browser via the described injection chain against the third-party target, not against the developer who installs the package. ## Source: ghsa-malware (634bf43fdaf0896cad38e5db9b7007dbae2994df1f00bcaa9c9098aa3f9eabb4) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Source published

19 Sep 2026 21:26:22 UTC

Source modified

8 Oct 2026 06:45:19 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.