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CVE-2025-59214 is a Windows File Explorer spoofing vulnerability that can expose sensitive information to an unauthorized actor over the network. The issue is associated with File Explorer preview handling for internet-downloaded files and appears to be part of a bypass chain for earlier Microsoft fixes addressing NTLM credential leakage. A crafted file marked with Mark of the Web can contain HTML-style references to external network paths; when the file is previewed in File Explorer, Windows may initiate outbound authentication to an attacker-controlled remote resource, disclosing NTLM credential material. The vulnerability is described as a bypass for CVE-2025-50154, which itself bypassed the earlier CVE-2025-24054 remediation. Microsoft’s October 2025 changes disabling preview-pane rendering for affected files indicate the vulnerable behavior is tied to preview processing of untrusted content in File Explorer.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Windows File Explorer spoofing issue referenced in the context of preventing NTLM credential leakage / sensitive information leakage over the network.
A Windows File Explorer issue (described as a spoofing issue) that can be leveraged to leak sensitive information (NTLM credentials/hashes) over the network, apparently via preview-related behavior and external path references.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.