Microsoft Exchange Server Cross-Site Scripting Vulnerability
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.
What happened
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.
CISA lists it as exploited, added 15 May 2026.
Does it affect you
Names Microsoft Exchange Server. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
msrc.microsoft.com - Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- ms-exchange
- Microsoft Exchange Server: exactly 2016
The record
- NVD status
- Analyzed
- Published
- 14 May 2026, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 6.1, Medium — computed here from the vector; NVD states 6.1.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 15 May 2026; federal remediation due 29 May 2026. CISA entry
- Exploit probability
- EPSS 0.5%, 43rd percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Microsoft · Microsoft (CISA)
References on the NVD record
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897MitigationVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897US Government Resource
Reporting that names this identifier
- Microsoft Patches Exploited Exchange Server Vulnerability — SecurityWeek, 5 mo ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.