CVE 2013-6111

Cross-site scripting (XSS) vulnerability in the mod_pagespeed module 0.x, 1.0.22.7, 1.1.x, 1.24.1, 1.3.25.1 through 1.3.25.4, 1.4.26.1 through 1.4.26.4, 1.5.27.1 through 1.5.27.3, and 1.6.29.1 through 1.6.29.6 for the Apache HTTP Server allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

See the CVE page on Mitre.org for more details.