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PatchSiren cyber security CVE debrief

CVE-2026-49801 Microsoft CVE debrief

CVE-2026-49801 is a medium-severity vulnerability in Windows SMB that allows an authorized attacker to disclose information locally. The vulnerability is caused by the use of an uninitialized resource. Affected product deployments should be identified, and owners assigned for follow-up. Official advisories and CVE records should be reviewed for mitigation guidance.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Administrators and users of Windows SMB should be aware of this vulnerability and take necessary precautions to prevent exploitation. Affected operators, platforms, and security teams should review vulnerability management and implement compensating controls where necessary.

Technical summary

The vulnerability is caused by the use of an uninitialized resource in Windows SMB, which allows an authorized attacker to disclose information locally. The vulnerability has a CVSS score of 5.5 and a CVSS severity of MEDIUM. Defenders should focus on applying patches and ensuring proper configuration and security of Windows SMB.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure that Windows SMB is properly configured and secured
  • Monitor for suspicious activity on the network
  • Implement compensating controls to prevent exploitation
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. Microsoft has provided a patch for the vulnerability. Evidence of exploitation is limited, and defenders should verify affected product deployments and review official advisories for mitigation guidance.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:56.347Z and has not been modified since then. The NVD entry is currently Analyzed.