CVE-2008-4033: Microsoft XML Core Services

Medium severity, CVSS 4.3. EPSS: 27.7% chance of exploitation in the next 30 days.

Cross-domain vulnerability in Microsoft XML Core Services 3.0 through 6.0, as used in Microsoft Expression Web, Office, Internet Explorer, and other products, allows remote attackers to obtain sensitive information from another domain and corrupt the session state via HTTP request header fields, as demonstrated by the Transfer-Encoding field, aka "MSXML Header Request Vulnerability."

Affected products

• Microsoft XML Core Services: version 4.0 only; version 3.0 only; version 6.0 only; version 5.0 only

Published 2008-11-12. Last modified 2026-06-16.