B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
88%
88% -- zero day threat protection rate for Windows Defender (2026)
Windows Defender cleared only 88% of zero-day threats according to AV-Test results.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
88%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
AV-Test
Primary
Tier C
https://antivirusinsider.com/windows-defender-vs-bitdefender/ ↗
Source Article
Windows Defender Vs Bitdefender: Antivirus Comparison
Original Research
AV-Test
· Original study ↗
Methodology
AV-Test lab results cited by secondary source
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Windows Defender: 88% zero day threat protection rate. Source: AV-Test (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/windows-defender-zero-day-88
HTML Embed
<blockquote cite="https://lighthousedata.io/data/windows-defender-zero-day-88" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>88%</strong> -- zero day threat protection rate for Windows Defender<br><small>Source: AV-Test (2026) · <a href="https://lighthousedata.io/data/windows-defender-zero-day-88" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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