exchange server subscription edition vulnerabilities and fixes

Recent CVEs affecting exchange server subscription edition, with upgrade or downgrade steps. 1 tracked.

Also searched as: exchangeserversubscriptionedition.

exchange server subscription edition has 1 tracked vulnerability, 0 critical and 1 exploited in the wild (CISA KEV). A fixed release or vendor patch exists for 1. Most recent: 2026-05-14. Highest priority: CVE-2026-42897 (score 83/100).

• CVE-2026-42897 HIGH 8.1 EXPLOITED DOWNGRADE UPGRADE Microsoft Exchange Server Cross-Site Scripting Vulnerability

FAQ

How do I fix exchange server subscription edition vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is exchange server subscription edition being exploited right now?

Yes: 1 exchange server subscription edition CVE is on the CISA Known Exploited Vulnerabilities list, so patch it first.

Which exchange server subscription edition CVE should I patch first?

CVE-2026-42897 currently ranks highest (83/100): Microsoft Exchange Server Cross-Site Scripting Vulnerability.

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