boxscore/security
PRODUCT · referenceProducts · latest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

Windows 11 Version 26H1

Product reference — Windows 11 Version 26H1 by Microsoft · sector: Operating Systems & Platforms. Cumulative disclosure record for this product across the archive.

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Product totals

Disclosures & known-exploited
All-timeYTD
CVEs891890
KEV entries88
Rate & severity
KEV/100Med CVSSMed EPSSCHML
0.97.8.0031246751875

KEV/100 = KEV entries ÷ CVEs × 100. Med CVSS / Med EPSS are medians over this product's disclosures. C/H/M/L = disclosures by CVSS severity band.

Monthly disclosures

Trend (by first-seen month, full archive): ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃▂▃█▅

Last 12 months (new CVEs by first-seen day)
MonthNew CVEs
2025-090
2025-100
2025-110
2025-120
2026-010
2026-0225
2026-030
2026-04117
2026-0560
2026-06111
2026-07382
2026-08195

Notable CVEs

Ranked by the published formula: KEV → EPSS → CVSS → CVE ID.

Notable (ranked)
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-338249.899.5CRITICALYES2026-04-14
CVE-2026-322024.399.2MEDIUMYES2026-04-28
CVE-2026-215108.897.8HIGHYES2026-02-10
CVE-2026-215138.896.5HIGHYES2026-02-10
CVE-2026-215256.291.5MEDIUMYES2026-02-10
CVE-2026-215337.889.3HIGHYES2026-02-10
CVE-2026-215197.882.9HIGHYES2026-02-10
CVE-2026-688207.026.2HIGHYES2026-08-11
CVE-2026-491607.598.9HIGH—2026-06-09
CVE-2026-472919.897.5CRITICAL—2026-06-09
CVE-2026-456579.896.5CRITICAL—2026-06-09
CVE-2026-212493.395.5LOW—2026-02-10
CVE-2026-429807.893.6HIGH—2026-06-09
CVE-2026-505076.891.6MEDIUM—2026-06-09
CVE-2026-403697.891.1HIGH—2026-05-12

Recent CVEs

Most recently seen
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-729715.528.9MEDIUM—2026-08-11
CVE-2026-703485.535.6MEDIUM—2026-08-11
CVE-2026-703467.823.9HIGH—2026-08-11
CVE-2026-703447.823.9HIGH—2026-08-11
CVE-2026-703477.823.8HIGH—2026-08-11
CVE-2026-703457.815.4HIGH—2026-08-11
CVE-2026-703307.824.4HIGH—2026-08-11
CVE-2026-703077.019.1HIGH—2026-08-11
CVE-2026-703047.824.4HIGH—2026-08-11
CVE-2026-688207.026.2HIGHYES2026-08-11
CVE-2026-668047.887.9HIGH—2026-08-11
CVE-2026-668028.128.4HIGH—2026-08-11
CVE-2026-658147.816.9HIGH—2026-08-11
CVE-2026-667997.819.2HIGH—2026-08-11
CVE-2026-657997.815.8HIGH—2026-08-11

KEV entries

CISA Known Exploited Vulnerabilities (newest addition first)
CVEKEV addedCVSSEPSS %ileSeverity
CVE-2026-338242026-08-189.899.5CRITICAL
CVE-2026-688202026-08-117.026.2HIGH
CVE-2026-322022026-04-284.399.2MEDIUM
CVE-2026-215332026-02-107.889.3HIGH
CVE-2026-215252026-02-106.291.5MEDIUM
CVE-2026-215192026-02-107.882.9HIGH
CVE-2026-215132026-02-108.896.5HIGH
CVE-2026-215102026-02-108.897.8HIGH

Related

Vendor: Microsoft — all products and the full vendor record.

Methodology

A product is a (vendor, product) pair as named in the affected-product data. Rate statistics are arithmetic over published figures. Counts key to first-seen day. Raw counts are not comparable across products; this is a reference page assembled from the public record, not a ranking by our judgment.

Sources. CVE Program (cvelistV5), NVD (NIST), CISA KEV, FIRST EPSS.