cve-2026-42897

About this tag
CVE-2026-42897 is a Microsoft Exchange Server spoofing vulnerability affecting Outlook Web Access (OWA) in on-premises Exchange Server 2016, 2019, and Subscription Edition. Disclosed in May 2026, it was addressed through the Exchange Emergency Mitigation Service or the Exchange On-premises Mitigation Tool rather than a conventional patch. The June 2026 Exchange Security Updates included additional fixes for this CVE, emphasizing that Exchange patching now requires lifecycle discipline. Administrators must verify mitigation M2 is applied, as the vulnerability targets identity presentation in email and webmail, increasing phishing and fraud risks. Discussions on WindowsForum cover the disclosure, mitigation steps, and the broader implications for Exchange security management.

  1. June 2026 Exchange Security Updates: ESU Gate, CVE-2026-42897, and OWA Mitigations

    Microsoft released June 2026 Security Updates for Exchange Server Subscription Edition, plus ESU-only updates for Exchange Server 2019 CU14/CU15 and Exchange Server 2016 CU23, on June 9, 2026, addressing newly disclosed Exchange vulnerabilities and the earlier CVE-2026-42897 Outlook Web Access...
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    • cve-2026-42897 esu period 2 esu program exchange server kb5094139 owa security security updates
    • Replies: 1
    • Forum: Windows News

  2. CVE-2026-42897 Exchange OWA Mitigation M2: What Admins Must Verify

    On May 14, 2026, Microsoft disclosed CVE-2026-42897, an Exchange Server Outlook Web Access vulnerability affecting on-premises Exchange Server 2016, Exchange Server 2019, and Exchange Server Subscription Edition, with mitigation available immediately through Exchange Emergency Mitigation Service...
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    • cve-2026-42897 emergency mitigation service microsoft exchange outlook web access
    • Replies: 0
    • Forum: Windows News

  3. CVE-2026-42897 Exchange Spoofing: Why This May 2026 Patch Matters

    Microsoft has disclosed CVE-2026-42897 as a Microsoft Exchange Server spoofing vulnerability in the May 2026 security cycle, with the advisory pointing administrators to Exchange Server as the affected product family and framing the issue as a confirmed security flaw rather than a speculative...
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    • cve-2026-42897 email security microsoft exchange security spoofing
    • Replies: 0
    • Forum: Security Alerts