Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Sling XSS. This issue affects Apache Sling XSS: before 2.4.12. Users are recommended to upgrade to version 2.4.12, which fixes the issue.
https://lists.apache.org/thread/yfb1q6zob8mth5lr4jnsy3lhx9rfwb02