How severe is CVE-2025-26635?

CVE-2025-26635 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-26635 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-26635?

CVE-2025-26635 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-2025-26635?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-26635 have an EU (EUVD) identifier?

Yes. CVE-2025-26635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10233.

When was CVE-2025-26635 published?

CVE-2025-26635 was published on 2025-04-08 and last updated on 2026-06-17.

CVE-2025-26635

CVE-2025-26635 is a medium-severity vulnerability in Microsoft Windows 10 1809 with a CVSS 3.x base score of 6.5. 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-1390.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10233
Weakness: CWE-1390
Affected product: Microsoft Windows 10 1809
Published: 2025-04-08
Last modified: 2026-06-17

Description

Weak authentication in Windows Hello allows an authorized attacker to bypass a security feature over a network.

Frequently asked questions

What is CVE-2025-26635?: Weak authentication in Windows Hello allows an authorized attacker to bypass a security feature over a network.
How severe is CVE-2025-26635?: CVE-2025-26635 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-26635 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26635?: CVE-2025-26635 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-2025-26635?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-26635 have an EU (EUVD) identifier?: Yes. CVE-2025-26635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10233.
When was CVE-2025-26635 published?: CVE-2025-26635 was published on 2025-04-08 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26635

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:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
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:*:*:*:*:*:*:x64:*

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Other CWE-1390 vulnerabilities

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CVE-2026-28710 — Critical (CVSS 9.8): Sensitive information disclosure and manipulation due to improper authentication. The following products are affected:…
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CVE-2025-40552 — Critical (CVSS 9.8): SolarWinds Web Help Desk was found to be susceptible to an authentication bypass vulnerability that if exploited, would…

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