- Engineer — Learn: No patch or configuration fix addresses this attack path — it exploits network position, not a software vulnerability. Review M365 Conditional Access policies to enforce device compliance and block legacy auth as a longer-term hardening measure.
- SOC/IR — Act: APT29 campaign with confirmed M365 targeting warrants a hunt for anomalous OAuth token activity and sign-ins from hotel/travel IP ranges since early 2026; tune Conditional Access sign-in logs for impossible-travel or unfamiliar network anomalies and brief on-call on the TTP.
- Leader — Plan: Nation-state targeting of business travelers via hotel networks is a reputational and credential-risk issue worth a travel security advisory this quarter; if your org has frequent international travel, update travel security policy and consider M365 session controls for roaming users.