CVE-2026-42897
Actively exploited. CVE-2026-42897 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-15) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-42897 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
An attacker can exploit multiple vulnerabilities in Microsoft Windows products to execute arbitrary code, escalate privileges, conduct a Denial of Service attack, disclose information, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to execute arbitrary code, escalate privileges, conduct denial of service attacks, disclose information, and bypass security measures.
- Who is affected
- All deployments of Microsoft Windows products are affected.
- Urgency
- Remediation is urgent due to the critical severity and confirmed exploitation.
- Action
- Apply the latest security updates provided by Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.4% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-42897 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (4)
- critical[UPDATE] [critical] Microsoft Windows products: Multiple vulnerabilitiescert-bund · 2026-07-09
- unknownexploitedSecurity Alert: Microsoft Releases June 2026 Security Updatesjpcert · 2026-06-10
- unknownexploited[Update] Vulnerability in Microsoft Exchange Server (May 15, 2026)cert-fr-alerte · 2026-05-15
- criticalexploitedCVE-2026-42897: Microsoft Exchange Server Cross-Site Scripting Vulnerabilitycisa-kev · 2026-05-15
External references
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