CVE-2026-70055

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Exposure of Sensitive Information in Windows Cryptographic Services

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Exposure of sensitive system information to an unauthorized control sphere in Windows Cryptographic Services allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70055

EUVD

EUVD-2026-99860

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-497	The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.

Attack-Flow Graph

Executive Summary

This vulnerability involves the exposure of sensitive system information to an unauthorized control sphere in Windows Cryptographic Services. An authorized attacker can locally disclose this information, potentially leading to data leaks.

Detection Guidance

This vulnerability involves information disclosure in Windows Cryptographic Services. Detection typically requires monitoring for unusual access to cryptographic service logs or registry keys. Check Windows Event Viewer for events related to cryptographic operations under Applications and Services Logs > Microsoft > Windows > CAPI2. Review registry keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Cryptography for unauthorized modifications.

Impact Analysis

An attacker could exploit this to access sensitive system information locally, which may include configuration details or internal data. This could lead to further attacks or unauthorized access if combined with other vulnerabilities.

Compliance Impact

This vulnerability allows unauthorized local disclosure of sensitive system information, which could lead to exposure of personal or confidential data. This may violate GDPR's data protection principles if personal data is involved, and HIPAA's security requirements if protected health information is compromised.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Cryptographic Services vulnerability. Monitor Microsoft's update guide for the specific patch release.

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