CVE-2011-1498: Apache Httpclient

Medium severity, CVSS 4.3. EPSS: 6.7% chance of exploitation in the next 30 days.

Apache HttpClient 4.x before 4.1.1 in Apache HttpComponents, when used with an authenticating proxy server, sends the Proxy-Authorization header to the origin server, which allows remote web servers to obtain sensitive information by logging this header.

Affected products

• Apache Httpclient: version 4.0 only; version 4.0.1 only; version 4.1 only

Published 2011-07-07. Last modified 2026-06-16.