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Exchange Server CVE-2026-42897 OWA XSS Mitigation Issue Cosmetic, Exploitability Remains Active
Microsoft disclosed cosmetic issues with mitigation display for CVE-2026-42897 (Exchange OWA XSS). The mitigation DOES apply successfully despite "invalid for this version" messaging. Security update in development for Exchange SE RTM, 2016 CU23, and 2019 CU14/15; Period 1 ESU customers will not receive updates.
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