Defender Security Intelligence 1.455.436.0

Microsoft published Security Intelligence package 1.455.436.0 with a matching detection changelog. Engine 1.1.26060.3008 and Platform 4.18.26060.3008 are unchanged.

What changed

The installable package and Microsoft detection changelog advanced to 1.455.436.0 on 31 July 2026. Both official feeds are aligned.

Technical details

Current installable security intelligence package
Matching Microsoft detection changelog
Separate Engine and Platform baselines

Why it matters

Security Intelligence, Engine and Platform must be inventoried separately. A current signature version alone does not prove complete Defender health.

Known limitations

Platform, Engine and Security Intelligence can briefly differ during phased distribution
The published target does not prove that every managed device has already received it

Now check

Report AntivirusSignatureVersion 1.455.436.0 and signature age
Check AMEngineVersion 1.1.26060.3008 and AMProductVersion 4.18.26060.3008 separately
Prioritize devices with stale intelligence or failed update sources