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Low Severity

Spam: Firebase password reset from suspicious sender

Description

Detects Firebase password reset messages from suspicious or new senders that may be attempting to abuse the Firebase authentication service.

References

No references.

Sublime Security
Created Dec 2nd, 2025 • Last updated Dec 2nd, 2025
Source
type.inbound
and sender.email.domain.root_domain == "firebaseapp.com"
and length(filter(body.links,
                  .href_url.domain.root_domain not in ("aka.ms")
                  and .href_url.path is not null
           )
) == 1
and any(body.links,
        .href_url.domain.domain == sender.email.domain.domain
        and .href_url.path == "/__/auth/action"
        and any(.href_url.query_params_decoded["mode"], . == "resetPassword")
)
and (
  (
    not profile.by_sender().solicited
    and profile.by_sender().prevalence == "new"
  )
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
  or not headers.auth_summary.dmarc.pass
)
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