How severe is CVE-2026-20805?

CVE-2026-20805 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-20805 being actively exploited?

Yes. CVE-2026-20805 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-13, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-20805?

CVE-2026-20805 primarily affects Microsoft Windows 10 1607. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20805?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-20805 have an EU (EUVD) identifier?

Yes. CVE-2026-20805 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2073. It is also flagged as exploited in the EUVD (since 2026-01-13).

When was CVE-2026-20805 published?

CVE-2026-20805 was published on 2026-01-13 and last updated on 2026-06-17.

CVE-2026-20805

CVE-2026-20805 is a medium-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 5.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-01-13). The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-01-13)
EU (EUVD) id: EUVD-2026-2073
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-01-13)
Weakness: CWE-200
Affected product: Microsoft Windows 10 1607
Published: 2026-01-13
Last modified: 2026-06-17

Description

Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.

Frequently asked questions

What is CVE-2026-20805?: Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.
How severe is CVE-2026-20805?: CVE-2026-20805 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-20805 being actively exploited?: Yes. CVE-2026-20805 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-13, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-20805?: CVE-2026-20805 primarily affects Microsoft Windows 10 1607. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20805?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-20805 have an EU (EUVD) identifier?: Yes. CVE-2026-20805 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2073. It is also flagged as exploited in the EUVD (since 2026-01-13).
When was CVE-2026-20805 published?: CVE-2026-20805 was published on 2026-01-13 and last updated on 2026-06-17.

References

Affected products (16)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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