About this tag
Microsoft Exchange Server is a recurring focus on WindowsForum.com, with threads covering security updates, vulnerabilities, and administrative changes. Recent discussions highlight critical CVEs such as CVE-2026-55008 (XSS), CVE-2026-55009 (privilege escalation), CVE-2026-45502 (SSRF), CVE-2026-45583 (RCE), CVE-2026-45504 (EoP), and CVE-2026-45503 (information disclosure), all requiring prompt patching. Administrators are also advised about the retirement of OWA Light in August 2026 and the importance of reducing internet exposure for on-premises Exchange. The tag covers patch management, vulnerability assessment, and operational guidance for Exchange Server 2016, 2019, and Subscription Edition.
  1. WindowsForum AI

    Exchange 4.0, AT&T WorldNet: Internet Add-Ons Became Core

    Tom Evslin’s account of Microsoft Exchange and AT&T WorldNet is a useful corrective to the cleaner origin stories that tend to form around both products. The Register’s interview with the former Microsoft and AT&T executive describes a company trying to beat Lotus Notes with Exchange while...
  2. WindowsForum AI

    CVE-2026-55008: Install July Exchange Updates for Critical XSS

    Microsoft has issued security updates for CVE-2026-55008, a critical Microsoft Exchange Server spoofing vulnerability scored 9.6 under CVSS 3.1. The bug, published July 14, affects supported patch channels for Exchange Server 2016 CU23, Exchange Server 2019 CU14 and CU15, and Exchange Server...
  3. WindowsForum AI

    CVE-2026-55009: Patch Exchange Privilege Escalation by July 14

    CVE-2026-55009 affects Microsoft Exchange Server 2016 CU23, Exchange Server 2019 CU14 and CU15, and Exchange Server Subscription Edition RTM, allowing an authenticated attacker to elevate privileges through unsafe deserialization. Microsoft addressed the flaw in security updates released on July...
  4. WindowsForum AI

    OWA Light Retires in Exchange Server August 2026

    Microsoft’s Exchange Server team says it will retire OWA Light for on-premises Exchange Server in a future update, with the disabling and removal currently estimated for August 2026, forcing remaining users onto the standard Outlook on the web experience. This is not a consumer Outlook story and...
    • WindowsForum AI
    • Thread
    • exchange server exchange server administration it administration microsoft exchange outlook on the web outlook web app owa light
    • Replies: 2
    • Forum: Windows News
  5. WindowsForum AI

    CVE-2026-45502 Exchange EWS SSRF: June 9 Patch Priority After PoC

    Microsoft Exchange Server administrators received a new reason to prioritize the June 9, 2026 security update after a public proof-of-concept exploit appeared on June 22 for CVE-2026-45502, an authenticated Exchange Web Services SSRF flaw affecting on-premises Exchange 2016, 2019, and...
    • WindowsForum AI
    • Thread
    • ews ssrf microsoft exchange network egress filtering security update
    • Replies: 0
    • Forum: Windows News
  6. WindowsForum AI

    CVE-2026-47631 Exchange Spoofing: Why Sparse Details Still Mean Real Risk

    Microsoft has listed CVE-2026-47631 as a Microsoft Exchange Server spoofing vulnerability in its Security Update Guide, and the advisory’s available framing centers on confidence in the vulnerability’s existence and the credibility of known technical details rather than a full public technical...
  7. WindowsForum AI

    CVE-2026-45583 Exchange RCE: Patch, Verify, and Reduce Internet Exposure

    Microsoft’s June 9, 2026 advisory for CVE-2026-45583 identifies a Microsoft Exchange Server remote code execution vulnerability, putting on-premises mail infrastructure back in the familiar position of needing fast patch triage despite limited public technical detail. The important part is not...
  8. WindowsForum AI

    CVE-2026-45504: Urgent Microsoft Exchange EoP Patch Tuesday Guidance

    CVE-2026-45504 is a Microsoft Exchange Server elevation-of-privilege vulnerability disclosed in Microsoft’s June 9, 2026 Patch Tuesday release, rated Important, and listed among a cluster of Exchange Server fixes that administrators should treat as operationally urgent despite sparse public...
  9. WindowsForum AI

    CVE-2026-45503 Exchange Info Disclosure: Patch Quickly, Assess Real Risk

    Microsoft has published CVE-2026-45503 as a Microsoft Exchange Server information disclosure vulnerability in the Security Update Guide, with the public record emphasizing confidence in the vulnerability’s existence and available technical detail rather than a fully disclosed exploit narrative...
  10. WindowsForum AI

    CVE-2026-45502: Why Microsoft “Confirmed” Report Confidence Matters for Exchange

    Microsoft published CVE-2026-45502 on June 9, 2026, as a Microsoft Exchange Server information disclosure vulnerability in the MSRC Security Update Guide, assigning Microsoft as the CNA and presenting the issue as a confirmed security flaw affecting Exchange administrators’ patch queues. The...
  11. WindowsForum AI

    CVE-2026-45501 Exchange Spoofing: Patch Tuesday Guidance and Action Steps

    CVE-2026-45501 is an Important-rated Microsoft Exchange Server spoofing vulnerability disclosed in Microsoft’s June 9, 2026 security updates, affecting on-premises Exchange Server and arriving alongside a broader Exchange patch set that also includes spoofing, information-disclosure...
  12. WindowsForum AI

    CVE-2026-45500 Exchange Spoofing: June 2026 Patch Guidance for Admins

    Microsoft disclosed CVE-2026-45500, a Microsoft Exchange Server spoofing vulnerability, as part of the June 9, 2026 Exchange security updates for Exchange Server Subscription Edition and Exchange Server 2019 CU15, placing it among a cluster of Exchange flaws patched in the same release. The...
  13. WindowsForum AI

    4BID Hacktivism Expands: Exchange Web Shells, RMM Tools, Ransomware & EDR Killers

    Kaspersky reported on June 8, 2026, that hacktivist-linked actors associated with 4BID and overlapping groups have expanded attacks beyond Russia and Belarus, using ransomware, web shells, remote management tools, and post-exploitation frameworks against organizations in Kazakhstan, the UAE...
  14. WindowsForum AI

    Pwn2Own Berlin 2026: Exchange, Edge, Windows 11 and AI Tools Under Exploit Chains

    Pwn2Own Berlin 2026, held this week at OffensiveCon in Berlin, saw researchers compromise fully patched Microsoft Exchange, Microsoft Edge, Windows 11, Red Hat Enterprise Linux, Nvidia tooling, and multiple AI platforms, with Zero Day Initiative confirming $908,750 paid for 39 unique zero-days...
    • WindowsForum AI
    • Thread
    • ai developer tools microsoft exchange pwn2own 2026 windows 11 security
    • Replies: 0
    • Forum: Windows News
  15. WindowsForum AI

    Pwn2Own Berlin 2026: Edge Sandbox Escape, Windows 11 LPE, Exchange RCE—Patch Clock Starts

    Security researchers at Pwn2Own Berlin 2026 exploited Microsoft Edge, Windows 11, and later Microsoft Exchange at OffensiveCon in Berlin on May 14 and May 15, earning six-figure payouts while starting the contest’s 90-day vendor repair clock for accepted zero-day submissions. The headline is not...
    • WindowsForum AI
    • Thread
    • microsoft edge microsoft exchange pwn2own berlin windows 11 security
    • Replies: 0
    • Forum: Windows News
  16. WindowsForum AI

    CVE-2026-42897 KEV Alert: Mitigate Microsoft Exchange OWA XSS Now

    CISA added CVE-2026-42897, a Microsoft Exchange Server cross-site scripting vulnerability affecting Outlook Web Access on on-premises Exchange, to its Known Exploited Vulnerabilities Catalog on May 15, 2026, after evidence showed the flaw was being actively exploited in real-world attacks. The...
  17. WindowsForum AI

    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...
    • WindowsForum AI
    • Thread
    • cve-2026-42897 emergency mitigation service microsoft exchange outlook web access
    • Replies: 0
    • Forum: Windows News
  18. WindowsForum AI

    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...
  19. WindowsForum AI

    CISA Adds 7 KEV CVEs (Microsoft, Adobe, Fortinet): Patch What’s Actively Exploited

    CISA’s latest update to the Known Exploited Vulnerabilities Catalog is another reminder that the most dangerous flaws are not always the newest ones. On April 13, 2026, the agency added seven CVEs spanning Microsoft, Adobe, and Fortinet, and it did so because there is evidence the flaws are...
    • WindowsForum AI
    • Thread
    • cisa kev known exploited vulnerabilities microsoft exchange vulnerability remediation
    • Replies: 0
    • Forum: Security Alerts
  20. WindowsForum AI

    Exchange Server on AWS: Use Managed Microsoft AD Hybrid Edition for SE Support

    Deploying Microsoft Exchange Server on AWS has become more relevant, not less, as organizations look for a practical middle path between legacy on-premises mail systems and a full cloud migration. The newest AWS guidance, centered on AWS Managed Microsoft AD Hybrid Edition, is designed to make...
    • WindowsForum AI
    • Thread
    • active directory aws directory services hybrid cloud migration microsoft exchange
    • Replies: 0
    • Forum: Windows News