FKIE_CVE-2026-20939

Vulnerability from fkie_nvd - Published: 2026-01-13 18:16 - Updated: 2026-01-16 15:52
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
References
secure@microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20939Vendor Advisory
Impacted products
Vendor Product Version
microsoft windows_10_1607 *
microsoft windows_10_1607 *
microsoft windows_10_1809 *
microsoft windows_10_1809 *
microsoft windows_10_21h2 *
microsoft windows_10_21h2 *
microsoft windows_10_21h2 *
microsoft windows_10_22h2 *
microsoft windows_10_22h2 *
microsoft windows_10_22h2 *
microsoft windows_11_23h2 *
microsoft windows_11_23h2 *
microsoft windows_11_24h2 *
microsoft windows_11_24h2 *
microsoft windows_11_25h2 *
microsoft windows_11_25h2 *
microsoft windows_server_2016 *
microsoft windows_server_2019 *
microsoft windows_server_2022 *
microsoft windows_server_2022_23h2 *
microsoft windows_server_2025 *
To clipboard 

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  "cveTags": [],
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      "value": "Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally."
    }
  ],
  "id": "CVE-2026-20939",
  "lastModified": "2026-01-16T15:52:31.957",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
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      "tags": [
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      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20939"
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          "value": "CWE-200"
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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.