No-Patch

vulnerability 2026-04-26
PhantomRPC: Five Endpoint-Spoofing Paths to SYSTEM on Every Windows Build, No Patch Coming
Kaspersky disclosed PhantomRPC at Black Hat Asia 2026 — an architectural flaw in rpcrt4.dll that lets a low-priv process register a rogue RPC endpoint and hijack SYSTEM-level callers. Microsoft declined to patch.
windows rpc privilege-escalation kaspersky black-hat no-patch endpoint-mapper epm lpe

PhantomRPC: Five Endpoint-Spoofing Paths to SYSTEM on Every Windows Build, No Patch Coming