How severe is CVE-2026-23656?

CVE-2026-23656 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-23656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23656?

CVE-2026-23656 affects Microsoft Windows App. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23656?

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

Does CVE-2026-23656 have an EU (EUVD) identifier?

Yes. CVE-2026-23656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10579.

When was CVE-2026-23656 published?

CVE-2026-23656 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-23656

CVE-2026-23656 is a medium-severity vulnerability in Microsoft Windows App with a CVSS 3.x base score of 5.9. 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-345.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10579
Weakness: CWE-345
Affected product: Microsoft Windows App
Published: 2026-03-10
Last modified: 2026-06-17

Description

Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.

Frequently asked questions

What is CVE-2026-23656?: Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2026-23656?: CVE-2026-23656 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-23656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23656?: CVE-2026-23656 affects Microsoft Windows App. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23656 have an EU (EUVD) identifier?: Yes. CVE-2026-23656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10579.
When was CVE-2026-23656 published?: CVE-2026-23656 was published on 2026-03-10 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656

Affected products (1)

cpe:2.3:a:microsoft:windows_app:*:*:*:*:*:windows:*:*

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