Multiple vulnerabilities in Microsoft Windows (July 15, 2026)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Multiple vulnerabilities have been discovered in Microsoft Windows. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service. Microsoft states that the vulnerability CVE-2026-56155...
CSIRTS triage
- What
- Multiple vulnerabilities allow remote arbitrary code execution, privilege escalation, and remote denial of service.
- Who is affected
- All deployments of affected Microsoft Windows versions.
- Urgency
- Remediation is urgent due to active exploitation.
- Action
- Apply the latest security updates from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0869/
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.
- Exploitation confirmedCVE-2026-56155Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 82% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56155 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedSecurity Alert: [Updated] Microsoft Releases July 2026 Security Updatesjpcert
- criticalexploitedMicrosoft security advisory – July 2026 monthly rollup (AV26-698) – Update 3cccs
- unknownMicrosoft Monthly Security Update (July 2026)hkcert
- unknownexploitedNCSC-2026-0231 [1.00] [M/H] Vulnerabilities fixed in Microsoft Windowsncsc-nl
- highexploitedCVE-2026-56155: Insufficient granularity of access control in Active Directory Federation Services (AD FS) all…nvd
- criticalexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
- highexploitedCVE-2026-56155: Active Directory Federation Services Elevation of Privilege Vulnerabilitymsrc
- criticalexploitedCVE-2026-56155: Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vuln…cisa-kev
Recent advisories for Microsoft Windows
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.
- critical[NEW] [critical] Microsoft Windows products: Multiple vulnerabilitiescert-bund · 2026-07-27
- high[UPDATE] [high] Microsoft Windows: Multiple vulnerabilitiescert-bund · 2026-07-23
- medium[NEW] [medium] Microsoft Windows: Multiple Vulnerabilitiescert-bund · 2026-07-20
- medium[NEW] [medium] Microsoft Windows Terminal: Vulnerability allows code executioncert-bund · 2026-07-17
- medium[NEW] [medium] Microsoft Windows Admin Center: Vulnerability allows Cross-Site Scriptingcert-bund · 2026-07-17
- unknownMultiple vulnerabilities in Microsoft Windows (July 17, 2026)cert-fr-avis · 2026-07-17
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