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Malicious package

wcag-color-a11y-helpersnpm

Advisory published Updated

wcag-color-a11y-helpers is a confirmed malicious npm package (MAL-2026-17530) 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 wcag-color-a11y-helpers (npm)

MAL-2026-17530
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall wcag-color-a11y-helpers

What this malware does

Package is advertised as a WCAG color accessibility helper library but ships thunderboltRegistry.js, an IIFE that on module load executes shell commands (whoami, id, pwd, ifconfig/ip addr, hostname) and transmits the output via HTTP GET and DNS subdomain lookups to the hardcoded Burp Collaborator host gzjsunzfc6i9od2ouhb6dl4a61cs0qof.oastify.com, along with node/platform/pid metadata and an 'rce-poc' beacon string. The package exports factory functions under names mirroring Wix Thunderbolt internal registries (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, dataBindingRegistry, autoCompleteRegistry, thunderboltBuilderRegistry, thunderboltPreviewRegistry), and ships a registry-manifest.min.json that maps all of those registry names to thunderboltRegistry.js — a dependency-confusion/typosquat shape against Wix's @wix/thunderbolt-* internal registries. Any consumer that resolves one of these names loads and executes the recon/exfiltration payload. The a11y naming is a cover story unrelated to the actual code.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

8b6e72298f32298d6558f5d52eb7a9d5185b37fe8df14748bf61d6686dde1cb3

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for wcag-color-a11y-helpers (version 1.0.0).

  2. If you installed it — respond

    wcag-color-a11y-helpers 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 wcag-color-a11y-helpers 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. wcag-color-a11y-helpers 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-2026-020950

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks wcag-color-a11y-helpers-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

All malware advisories How O3 detects malware Vulnerability database
wcag-color-a11y-helpers (npm) malicious package — MAL-2026-17530 | O3 Security