boxscore/security
PRODUCT · referenceProducts · latest edition

Reference page — cumulative record through Monday, October 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.

Follow Windows 11 Version 26H1 — Atom feed

Product totals

Disclosures & known-exploited
All-timeYTD
CVEs25262525
KEV entries1010
Rate & severity
KEV/100Med CVSSMed EPSSCHML
0.47.5.00339118645665

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
2025-110
2025-120
2026-010
2026-0225
2026-030
2026-04117
2026-0560
2026-06111
2026-07382
2026-08194
2026-09628
2026-101008

Notable CVEs

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

Notable (ranked)
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-215108.897.9HIGHYES2026-02-10
CVE-2026-215138.896.9HIGHYES2026-02-10
CVE-2026-322024.392.0MEDIUMYES2026-04-28
CVE-2026-215256.291.9MEDIUMYES2026-02-10
CVE-2026-215337.890.7HIGHYES2026-02-10
CVE-2026-215197.884.3HIGHYES2026-02-10
CVE-2026-338249.875.7CRITICALYES2026-04-14
CVE-2026-969518.874.1HIGHYES2026-10-13
CVE-2026-819637.831.9HIGHYES2026-09-08
CVE-2026-688207.024.8HIGHYES2026-08-11
CVE-2026-212493.396.0LOW—2026-02-10
CVE-2026-505097.889.1HIGH—2026-07-14
CVE-2026-338294.389.0MEDIUM—2026-04-14
CVE-2026-212387.888.6HIGH—2026-02-10
CVE-2024-435828.187.8HIGH—2024-10-08

Recent CVEs

Most recently seen
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-881277.015.5HIGH—2026-10-13
CVE-2026-881017.89.9HIGH—2026-10-13
CVE-2026-858517.824.4HIGH—2026-10-13
CVE-2026-859368.845.2HIGH—2026-10-13
CVE-2026-853387.823.5HIGH—2026-10-13
CVE-2026-838767.826.1HIGH—2026-10-13
CVE-2026-838737.827.5HIGH—2026-10-13
CVE-2026-836397.823.2HIGH—2026-10-13
CVE-2026-835847.015.5HIGH—2026-10-13
CVE-2026-835797.826.0HIGH—2026-10-13
CVE-2026-835107.010.7HIGH—2026-10-13
CVE-2026-835097.020.7HIGH—2026-10-13
CVE-2026-835057.012.4HIGH—2026-10-13
CVE-2026-730277.828.7HIGH—2026-10-13
CVE-2026-702227.830.3HIGH—2026-10-13

KEV entries

CISA Known Exploited Vulnerabilities (newest addition first)
CVEKEV addedCVSSEPSS %ileSeverity
CVE-2026-969512026-10-138.874.1HIGH
CVE-2026-819632026-09-087.831.9HIGH
CVE-2026-338242026-08-189.875.7CRITICAL
CVE-2026-688202026-08-117.024.8HIGH
CVE-2026-322022026-04-284.392.0MEDIUM
CVE-2026-215332026-02-107.890.7HIGH
CVE-2026-215252026-02-106.291.9MEDIUM
CVE-2026-215192026-02-107.884.3HIGH
CVE-2026-215132026-02-108.896.9HIGH
CVE-2026-215102026-02-108.897.9HIGH

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.