- Engineer — Act: A public PoC exists for a flaw that lets any domain user compromise the Enterprise CA at Domain Controller privilege level — patch CVE-2026-54121 immediately, then audit certificate templates and CA permissions for standing privilege that survives the patch.
- SOC/IR — Plan: With a public PoC available but no active exploitation confirmed, build detections for anomalous ADCS activity: unusual certificate enrollment requests by standard users, low-privileged accounts invoking CA RPC interfaces, or certificates issued against sensitive templates — these are the behavioral signals that precede weaponization of this class of bug.
- Leader — Plan: This is a useful forcing function to confirm your PKI infrastructure is formally classified and defended as Tier 0 — ask your team to verify the Enterprise CA is in scope for your privileged-access model and that the patch is on an expedited timeline given the public PoC.
- Signals: CVE-2026-54121 — CISA KEV: not listed, EPSS 0.01, public PoC on GitHub