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Malicious package

css-a11y-contrast-utilsnpm

Advisory published Updated

css-a11y-contrast-utils is a confirmed malicious npm package (MAL-2026-17475) 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 css-a11y-contrast-utils (npm)

MAL-2026-17475
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall css-a11y-contrast-utils

What this malware does

[email protected] is advertised as a WCAG contrast utility but ships no contrast code — index.js exports an empty object. The package instead defines a Proxy stub exposing identifiers from Wix's internal Thunderbolt registry namespace (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.), and its manifest points at static.parastorage.com/unpkg/css-a11y-contrast-utils, consistent with a dependency-confusion squat targeting a private Wix registry. On module load, thunderboltRegistry.js runs an IIFE that executes hostname, id, and uname -r via child_process and exfiltrates the collected host, uid, kernel version, Node version, and pid by (a) issuing DNS lookups to subdomains of the hardcoded OAST collector davdpb8lhot13kgmnhp0863x9g83mpswq.oast.live and (b) HTTP GET to the hardcoded webhook https://webhook.site/0492a36c-4d7b-408a-865c-226db25987ba. The cover-story metadata plus internal-registry naming plus the on-load recon beacon make the entire purpose of the package a dependency-confusion payload against installers that resolve any of these registry names.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

85ad65ab7d49c4277898f5da5b5d45f3ec9cde46035bcf6416e3a95507ca1301

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for css-a11y-contrast-utils (version 1.0.0).

  2. If you installed it — respond

    css-a11y-contrast-utils 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.

  3. Did it already run?

    If css-a11y-contrast-utils 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

No. css-a11y-contrast-utils on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020881

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks css-a11y-contrast-utils-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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css-a11y-contrast-utils (npm) malicious package — MAL-2026-17475 | O3 Security