CISA adds Microsoft Exchange XSS to KEV Catalog

Editorial brief

CISA added CVE-2026-42897, a Microsoft Exchange Server cross-site scripting vulnerability with evidence of active exploitation, to the KEV Catalog on May 15. BOD 22-01 requires FCEB agencies to remediate by the posted due date. Non-federal operators are not bound but should treat KEV listing as a prioritization signal in their vulnerability management programs.