CVE-2026-50303: Use of a cryptographic primitive with a risky implementation in Windows Key Guard allows an authorized attacker to bypass a security feature locally.

mediumCVSS 5.5CVE-2026-50303

Use of a cryptographic primitive with a risky implementation in Windows Key Guard allows an authorized attacker to bypass a security feature locally.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.5
Published: 2026-07-14
Last updated: 2026-07-16
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-50303

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-2026-503030.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50303	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
mediumCVE-2026-50303: Windows Key Guard Security Feature Bypass Vulnerabilitymsrc

Recent advisories for Use of a

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.

unknownCVE-2026-20473: In display, there is a possible memory corruption due to use after free. This could lead to lo…nvd · 2026-08-03
highCVE-2026-10848: The OCPP 1.6 client in subsys/net/lib/ocpp parsed inbound WAMP RPC frames in parse_rpc_msg() (…nvd · 2026-08-02
highCVE-2025-71399: Better Auth relies on better-call, which uses the rou3 router library. In affected versions of…nvd · 2026-08-02
mediumCVE-2026-18573: A flaw was found in the keycloak-services component of Keycloak, which is used for managing au…nvd · 2026-08-02
unknownCVE-2026-18556: Authentication bypass using an alternate path or channel vulnerability in N-able N-central all…nvd · 2026-08-01
mediumCVE-2026-67335: better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the store…nvd · 2026-08-01