CVE record · CVE-2026-62757

Windows Schannel Security Feature Bypass Vulnerability

CVSS 5.3 MediumEPSS 0.0035 · 28th percentile

Published by the CVE Program (CNA: microsoft) at 11 Aug 2026, 17:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Windows 10 Version 1607	affected 10.0.14393.0 to before 10.0.14393.9418 custom
Microsoft	Windows 10 Version 1809	affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft	Windows 10 Version 21H2	affected 10.0.19044.0 to before 10.0.19044.7663 custom
Microsoft	Windows 10 Version 22H2	affected 10.0.19045.0 to before 10.0.19045.7663 custom
Microsoft	Windows 11 version 23H2	affected 10.0.22631.0 to before 10.0.22631.7517 custom
Microsoft	Windows 11 Version 23H2	affected 10.0.22631.0 to before 10.0.22631.7517 custom
Microsoft	Windows 11 Version 24H2	affected 10.0.26100.0 to before 10.0.26100.9168 custom
Microsoft	Windows 11 Version 25H2	affected 10.0.26200.0 to before 10.0.26200.9168 custom
Microsoft	Windows 11 version 26H1	affected 10.0.28000.0 to before 10.0.28000.2704 custom
Microsoft	Windows Server 2012	affected 6.2.9200.0 to before 6.2.9200.26280 custom
Microsoft	Windows Server 2012 (Server Core installation)	affected 6.2.9200.0 to before 6.2.9200.26280 custom
Microsoft	Windows Server 2012 R2	affected 6.3.9600.0 to before 6.3.9600.23338 custom
Microsoft	Windows Server 2012 R2 (Server Core installation)	affected 6.3.9600.0 to before 6.3.9600.23338 custom
Microsoft	Windows Server 2016	affected 10.0.14393.0 to before 10.0.14393.9418 custom
Microsoft	Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 to before 10.0.14393.9418 custom
Microsoft	Windows Server 2019	affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft	Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft	Windows Server 2022	affected 10.0.20348.0 to before 10.0.20348.5499 custom
Microsoft	Windows Server 2025	affected 10.0.26100.0 to before 10.0.26100.33296 custom
Microsoft	Windows Server 2025 (Server Core installation)	affected 10.0.26100.0 to before 10.0.26100.33296 custom

Identifiers: CVE-2026-62757
CNA: microsoft
Weakness (CWE): CWE-347
Tags: Microsoft Windows 10 Version 1607
Microsoft Windows 10 Version 1809
Microsoft Windows 10 Version 21H2
Microsoft Windows 10 Version 22H2
Microsoft Windows 11 version 23H2
Microsoft Windows 11 Version 24H2
Microsoft Windows 11 Version 25H2
Microsoft Windows 11 version 26H1
Weak cryptography or TLS
Published: 11 Aug 2026
Updated: 10 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.0035, the 28th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

11 Aug 2026, 17:06 UTC Confirmed by the CVE List

Sources

References from the CNA

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62757 vendor-advisorypatch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.