CVE-2026-55144: Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability
Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.
CSIRTS triage
- What
- Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.
- Who is affected
- Authorized users of Windows CryptoAPI are affected.
- Urgency
- Remediation is urgent due to the high severity and potential for local tampering.
- Action
- Apply the latest security patch to mitigate the vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55144
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-551440.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-55144 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
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