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CVE-2026-42897 Details
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.
A cross-site scripting vulnerability has been identified in Microsoft Exchange Server. This issue arises from improper input neutralization during web page generation, allowing an unauthorized attacker to perform spoofing over the network. The vulnerability affects multiple versions of Microsoft Exchange Server, including the Subscription Edition RTM, Exchange Server 2019 Cumulative Update 15, Exchange Server 2019 Cumulative Update 14, and Exchange Server 2016 Cumulative Update 23.
Users can enable the Exchange Emergency Mitigation Service, which provides automatic mitigation for this vulnerability. More information and instructions are available on the Microsoft Exchange blog.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 14, 2026Exploitation: ActiveAutomatable: NoTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897 | CISA-ADP | US Government Resource |
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897 | [email protected] | MitigationVendor Advisory |
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name | Date Added | Due Date | Required Action |
|---|---|---|---|
| Microsoft Exchange Server Cross-Site Scripting Vulnerability | May 15, 2026 | May 29, 2026 | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft exchange server | 2016 - 2016 cumulative_update_1 2016 cumulative_update_10 2016 cumulative_update_11 2016 cumulative_update_12 2016 cumulative_update_13 2016 cumulative_update_14 2016 cumulative_update_15 2016 cumulative_update_16 2016 cumulative_update_17 2016 cumulative_update_18 2016 cumulative_update_19 2016 cumulative_update_2 2016 cumulative_update_20 2016 cumulative_update_21 2016 cumulative_update_22 2016 cumulative_update_23 2016 cumulative_update_3 2016 cumulative_update_4 2016 cumulative_update_5 2016 cumulative_update_6 2016 cumulative_update_7 2016 cumulative_update_8 2016 cumulative_update_9 2019 - 2019 cumulative_update_1 2019 cumulative_update_10 2019 cumulative_update_11 2019 cumulative_update_12 2019 cumulative_update_13 2019 cumulative_update_14 2019 cumulative_update_2 2019 cumulative_update_3 2019 cumulative_update_4 2019 cumulative_update_5 2019 cumulative_update_6 2019 cumulative_update_7 2019 cumulative_update_8 2019 cumulative_update_9 |
CPE
Remediation
| |
| microsoft exchange server subscription edition | < 15.02.2562.043 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 15, 2026 | Modified Analysis | [email protected] |
| May 15, 2026 | Modified Analysis | [email protected] |
| May 15, 2026 | CVE CISA KEV Update | Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government |
| May 15, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 14, 2026 | New CVE Received | [email protected] |