EUVD-2026-44034
GHSA-4r8r-cjr4-hvqr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Local, authenticated foothold required (AV:L, PR:L) with low complexity and no UI; a missing crypto step enables data tampering and disclosure (I:H, C:H) with no availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.
AnalysisAI
Local tampering in Windows CryptoAPI (Crypt32) on Windows 11 (24H2/25H2/26H1) and Windows Server 2022/2025 stems from a missing cryptographic step, letting an authenticated local attacker undermine the integrity and confidentiality of cryptographically protected data. Microsoft rates it 7.1 (High) with high confidentiality and integrity impact; there is no public exploit identified at time of analysis and it is not on the CISA KEV list. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold a low-privileged authenticated local account on the target (PR:L, AV:L) and to invoke or influence a CryptoAPI operation that omits the required cryptographic step; no user interaction is needed (UI:N) and attack complexity is low (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N describes a local (AV:L), low-complexity attack that requires some existing privileges (PR:L) and no user interaction, yielding high confidentiality and integrity impact but no availability impact - a 7.1 High. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged local account on a Windows 11 or Windows Server 2025 host abuses the missing cryptographic step in CryptoAPI to forge or alter data that the system treats as cryptographically validated. Because AC:L and UI:N, once local access is held the manipulation is reliable and requires no victim interaction; no public exploit code is currently identified. |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-55144 delivered through the monthly Windows cumulative update for your specific SKU, tracked at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55144; the exact fixed build/KB is not provided in the input data and should be taken from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2022/2025 systems and identify those handling cryptographically sensitive or regulated data. …
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External POC / Exploit Code
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