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    CVE-2026-42897

    Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

    Published:May 14, 2026
    Last Modified:Jun 15, 2026
    EPS:May 14, 2026
    EPSS Score:0.02509
    CVSS Score:8.1

    CISA Notification

    Description

    Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

    Required Action:

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    May 29, 2026
    105 days ago
    Alert Date
    May 15, 2026
    119 days ago

    Affected Products

    Vendor
    Microsoft
    Product
    Exchange Server
    Vendor
    Microsoft
    Product
    Exchange Server 2016
    Vendor
    Microsoft
    Product
    Exchange Server 2019
    Vendor
    Microsoft
    Product
    Exchange Server Se
    Vendor
    Microsoft
    Product
    Exchange Server Subscription Edition
    Vendor
    Microsoft
    Product
    Microsoft Exchange Server 2016 Cumulative Update 23
    Vendor
    Microsoft
    Product
    Microsoft Exchange Server 2019 Cumulative Update 14
    Vendor
    Microsoft
    Product
    Microsoft Exchange Server 2019 Cumulative Update 15

    Exploits

    https://github.com/atiilla/CVE-2026-42897

    Related CVEs

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    CVE-2026-65813 (CVSS 6.5) — Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privi…
    CVE-2026-62915 (CVSS 6.5) — Missing authorization in Microsoft Exchange Server allows an authorized attacker to bypass a security feature …
    CVE-2026-62914 (CVSS 7.3) — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Ser…
    CVE-2026-62913 (CVSS 8.8) — Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a n…
    CVE-2026-62912 (CVSS 6.5) — Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service o…
    CVE-2026-62910 (CVSS 7.2) — Improper control of resource identifiers ('resource injection') in Microsoft Exchange Server allows an authori…
    CVE-2026-47631 (CVSS 8.1) — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Ser…
    CVE-2026-45504 (CVSS 8.8) — Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privi…
    CVE-2026-45503 (CVSS 8.1) — Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High