boxscore/security
PRODUCT · referenceProducts · latest edition

Reference page — cumulative record through Wednesday, October 7, 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
CVEs15181517
KEV entries99
Rate & severity
KEV/100Med CVSSMed EPSSCHML
0.67.8.00334911553095

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
2026-100

Notable CVEs

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

Notable (ranked)
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-215108.897.8HIGHYES2026-02-10
CVE-2026-215138.896.8HIGHYES2026-02-10
CVE-2026-322024.391.8MEDIUMYES2026-04-28
CVE-2026-215256.291.7MEDIUMYES2026-02-10
CVE-2026-215337.890.5HIGHYES2026-02-10
CVE-2026-215197.883.9HIGHYES2026-02-10
CVE-2026-338249.875.3CRITICALYES2026-04-14
CVE-2026-819637.831.3HIGHYES2026-09-08
CVE-2026-688207.024.2HIGHYES2026-08-11
CVE-2026-212493.395.9LOW—2026-02-10
CVE-2026-505097.888.9HIGH—2026-07-14
CVE-2026-212387.888.4HIGH—2026-02-10
CVE-2024-435828.187.6HIGH—2024-10-08
CVE-2026-696947.086.0HIGH—2026-09-08
CVE-2026-212317.884.8HIGH—2026-02-10

Recent CVEs

Most recently seen
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2026-859218.226.3HIGH—2026-09-14
CVE-2026-853607.016.7HIGH—2026-09-08
CVE-2026-840017.566.5HIGH—2026-09-08
CVE-2026-839997.019.0HIGH—2026-09-08
CVE-2026-839968.824.4HIGH—2026-09-08
CVE-2026-839757.824.4HIGH—2026-09-08
CVE-2026-839988.855.8HIGH—2026-09-08
CVE-2026-839887.824.4HIGH—2026-09-08
CVE-2026-839915.521.0MEDIUM—2026-09-08
CVE-2026-839867.824.4HIGH—2026-09-08
CVE-2026-839797.824.4HIGH—2026-09-08
CVE-2026-839767.824.4HIGH—2026-09-08
CVE-2026-839747.824.4HIGH—2026-09-08
CVE-2026-839697.824.4HIGH—2026-09-08
CVE-2026-839527.824.4HIGH—2026-09-08

KEV entries

CISA Known Exploited Vulnerabilities (newest addition first)
CVEKEV addedCVSSEPSS %ileSeverity
CVE-2026-819632026-09-087.831.3HIGH
CVE-2026-338242026-08-189.875.3CRITICAL
CVE-2026-688202026-08-117.024.2HIGH
CVE-2026-322022026-04-284.391.8MEDIUM
CVE-2026-215332026-02-107.890.5HIGH
CVE-2026-215252026-02-106.291.7MEDIUM
CVE-2026-215192026-02-107.883.9HIGH
CVE-2026-215132026-02-108.896.8HIGH
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.