CVE-2026-55144: Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.

highCVSS 7.1CVE-2026-55144

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

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.1
Published: 2026-07-14
Last updated: 2026-07-21
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/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

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedNCSC-2026-0231 [1.00] [M/H] Vulnerabilities fixed in Microsoft Windowsncsc-nl
highCVE-2026-55144: Windows Cryptography API: Next Generation (CNG) Tampering Vulnerabilitymsrc

Recent advisories for Missing cryptographic step

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-59776: Missing Cryptographic Step (CWE-325) vulnerability exists in certain FeliCa IC chips shipped i…nvd · 2026-07-21
mediumCVE-2026-58638: Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a se…nvd · 2026-07-14