file explorer security

About this tag
Discussions on WindowsForum.com about file explorer security focus on vulnerabilities like CVE-2026-20872, an NTLM hash disclosure flaw tied to File Explorer's preview and metadata handling. This class of bug enables credential leakage by coercing Windows clients to authenticate to attacker-controlled SMB or UNC endpoints. While public technical details are limited, the flaw is considered real and actionable. Defenders should treat such vulnerabilities seriously and implement mitigations, such as disabling NTLM where possible or restricting preview pane functionality. The tag covers recurring themes of credential theft, SMB relay attacks, and Microsoft's security advisories related to File Explorer.

  1. CVE-2026-20872 NTLM Leak in File Explorer: Mitigations and Guidance

    Microsoft’s security channels have logged CVE-2026-20872 as an NTLM hash disclosure / spoofing vulnerability tied to File Explorer and preview/metadata handling — a class of bug that repeatedly enables low‑interaction credential leakage by coaxing Windows clients to authenticate to...
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    • cve 2026 20872 file explorer security ntlm leakage windows defense
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    • Forum: Security Alerts