CVE intelligence and bounded remediation

CVE-2026-47631 — Microsoft Exchange Server security vulnerability

High CVSS 8.1

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.

Severity
High
CVSS
8.1 (3.1)
Published
2026-06-09
CISA KEV
Not currently listed
Ecosystem
windows/system
Weaknesses
CWE-79

Affected products

  • microsoft / exchange_server / 2016
  • microsoft / exchange_server / 2019
  • microsoft / exchange_server_subscription_edition

Showing 3 representative product identities from 4 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Cross-site scripting and unsafe browser output

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Check exposure

  • Trace reflected, stored, and DOM-derived untrusted values into HTML, attributes, URLs, styles, scripts, and client-side template sinks.
  • Identify affected origins, authenticated user roles, sensitive browser capabilities, and where content is shared across tenants.
  • Review framework escaping, rich-text sanitization, legacy templates, and client-side rendering paths.

Remediate safely

  • Use context-aware framework output encoding and safe DOM APIs; keep untrusted data out of executable contexts.
  • Sanitize intentionally supported markup with a maintained allowlist policy and validate URLs and attributes separately.
  • Update affected rendering components and add tests for every output context using inert sentinel markup.

Authoritative sources

Complete CVE record and remediation plan

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