@mimecast-ui/componentsnpm
Advisory published Updated
@mimecast-ui/components is a confirmed malicious npm package (MAL-2026-3507) that executes malicious code on install (malicious version 2.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @mimecast-ui/components (npm)
What this malware does
The package @mimecast-ui/components was found to contain malicious code.
The OpenSSF Package Analysis project identified '@mimecast-ui/components' @ 2.0.0 (npm) as malicious.
It is considered malicious because:
- The package executes one or more commands associated with malicious behavior.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for @mimecast-ui/components (version 2.0.0).
If you installed it — respond
Remove @mimecast-ui/components 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 @mimecast-ui/components 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
Credits
- Amazon Inspector · finder
- OpenSSF: Package Analysis · finder
Detect & block this
O3 blocks @mimecast-ui/components-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.