How severe is CVE-2025-26678?

CVE-2025-26678 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-26678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-26678?

CVE-2025-26678 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-26678?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-26678 have an EU (EUVD) identifier?

Yes. CVE-2025-26678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10214.

When was CVE-2025-26678 published?

CVE-2025-26678 was published on 2025-04-08 and last updated on 2026-06-17.

CVE-2025-26678

CVE-2025-26678 is a high-severity vulnerability in Microsoft Windows 10 1809 with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10214
Weakness: CWE-284
Affected product: Microsoft Windows 10 1809
Published: 2025-04-08
Last modified: 2026-06-17

Description

Improper access control in Windows Defender Application Control (WDAC) allows an unauthorized attacker to bypass a security feature locally.

Frequently asked questions

What is CVE-2025-26678?: Improper access control in Windows Defender Application Control (WDAC) allows an unauthorized attacker to bypass a security feature locally.
How severe is CVE-2025-26678?: CVE-2025-26678 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-26678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26678?: CVE-2025-26678 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-26678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-26678 have an EU (EUVD) identifier?: Yes. CVE-2025-26678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10214.
When was CVE-2025-26678 published?: CVE-2025-26678 was published on 2025-04-08 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26678

Affected products (11)

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_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
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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