CVE-2026-58638: CWE-325: Missing Cryptographic Step in Microsoft Windows 10 Version 1809
Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-58638 and classified under CWE-325 (Missing Cryptographic Step), affects the Windows Boot Loader component in Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw involves a missing cryptographic step that enables an authorized local attacker with high privileges to bypass a security feature. The CVSS v3.1 base score is 6.0, indicating medium severity, with attack vector local, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality and integrity but no impact on availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker with high privileges can exploit this vulnerability to bypass a security feature in the Windows Boot Loader, potentially compromising system confidentiality and integrity. There is no impact on system availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1809 (build 10.0.17763.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58638.
CVE-2026-58638: CWE-325: Missing Cryptographic Step in Microsoft Windows 10 Version 1809
Description
Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.
CVSS v3.1
Score 6.0medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-58638 and classified under CWE-325 (Missing Cryptographic Step), affects the Windows Boot Loader component in Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw involves a missing cryptographic step that enables an authorized local attacker with high privileges to bypass a security feature. The CVSS v3.1 base score is 6.0, indicating medium severity, with attack vector local, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality and integrity but no impact on availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker with high privileges can exploit this vulnerability to bypass a security feature in the Windows Boot Loader, potentially compromising system confidentiality and integrity. There is no impact on system availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1809 (build 10.0.17763.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58638.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-01T21:14:44.618Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58638","vendor":"Microsoft"}]
Threat ID: 6a5676c568715ace43f0b62a
Added to database: 07/14/2026, 17:49:57 UTC
Last enriched: 08/13/2026, 16:13:06 UTC
Last updated: 08/27/2026, 22:52:12 UTC
Views: 86
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.