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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.

PUBLISHED Reserved 2026-04-30 | Published 2026-05-14 | Updated 2026-06-09 | Assigner microsoft




HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

CISA Known Exploited Vulnerability

Date added 2026-05-15 | Due date 2026-05-29

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

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

15.01.0.0 (custom) before 15.01.2507.069
affected

15.02.0.0 (custom) before 15.02.1544.041
affected

15.02.0.0 (custom) before 15.02.1748.046
affected

15.02.0.0 (custom) before 15.02.2562.043
affected

References

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-42897 government-resource

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897 (Microsoft Exchange Server Spoofing Vulnerability) vendor-advisory patch

cve.org (CVE-2026-42897)

nvd.nist.gov (CVE-2026-42897)

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