How severe is CVE-2026-55144?

CVE-2026-55144 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-55144 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55144?

CVE-2026-55144 primarily affects Microsoft Windows 11 24h2. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-55144?

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.

When was CVE-2026-55144 published?

CVE-2026-55144 was published on 2026-07-14 and last updated on 2026-07-21.

CVE-2026-55144

CVE-2026-55144 is a high-severity vulnerability in Microsoft Windows 11 24h2 with a CVSS 3.x base score of 7.1. 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-325.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-325
Affected product: Microsoft Windows 11 24h2
Published: 2026-07-14
Last modified: 2026-07-21

Description

Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.

Frequently asked questions

What is CVE-2026-55144?: Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.
How severe is CVE-2026-55144?: CVE-2026-55144 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-55144 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55144?: CVE-2026-55144 primarily affects Microsoft Windows 11 24h2. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-55144?: 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.
When was CVE-2026-55144 published?: CVE-2026-55144 was published on 2026-07-14 and last updated on 2026-07-21.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55144

Affected products (8)

cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows 11 24h2

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CVE-2026-45445 — High (CVSS 7.5): Issue summary: When an application drives an AES-OCB context through the public EVP_Cipher() one-shot interface, the…
CVE-2026-41395 — High (CVSS 7.5): OpenClaw before 2026.3.28 contains a webhook replay vulnerability in Plivo V3 signature verification that canonicalizes…
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