CVE detail
CVE-2026-42897: Microsoft Exchange Server Cross-Site Scripting Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Microsoft · Microsoft
- Date added (KEV)
- May 15, 2026
- CISA due date
- May 29, 2026
- Ransomware campaign use
- Unknown
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor fix: Vendor mitigation
Scorifya interpretation
AI-generatedA short, structured read of the record above — generated when this page first loads, then cached for a week.
Plain English
Technical detail
From CISA
Microsoft Exchange Server contains a cross-site scripting vulnerability during web page generation in Outlook Web Access and when certain interaction conditions are met, arbitrary JavaScript can be executed in the browser context.
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897 ; https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-emergency-mitigation-service ; https://nvd.nist.gov/vuln/detail/CVE-2026-42897
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897MitigationVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897US Government Resource
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Check your domain's public posture
Scorifya doesn't test for specific CVEs, but if patching Microsoft changed your headers or TLS, a fresh hardening scan helps confirm nothing regressed externally.