PT-2026-2717 · Microsoft · Windows Ntlm+1

Saumyajeet Das · Published 2026-01-13 · Updated 2026-01-13 · CVE-2026-20872

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions Windows NTLM (affected versions not specified)

Description An issue exists in Windows NTLM that allows an unauthorized attacker to perform spoofing over a network through external control of a file name or path.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-73

Related Identifiers

BDU:2026-00398

CVE-2026-20872

Affected Products

Windows

Windows Ntlm

References · 9

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20872 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20872 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20872 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20872 · Security Note
• https://osv.dev/vulnerability/CVE-2026-20872 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00398 · Security Note
• https://vicarius.io/vsociety/posts/cve-2026-20872-detection-script-spoofing-vulnerability-in-windows-ntlm · Note
• https://vicarius.io/vsociety/posts/cve-2026-20872-mitigation-script-spoofing-vulnerability-in-windows-ntlm · Note
• https://twitter.com/CVEnew/status/2011181511937282208 · Twitter Post