Release Date: March 03, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 2.8.3 and below, 3.0.0 to 3.0.1
Vulnerability Type: Cross-Site Scripting
Problem Description: The extension fails to properly sanitize user input. The vulnerability is exploitable only if the TypoScript setting search.keepExistingParametersForNewSearches is enabled (which is disabled by default).
Solution: Updated versions 2.8.4 and 3.0.2 are available from the TYPO3 Extension Manager and at https://typo3.org/extensions/repository/download/solr/2.8.4/t3x/ and https://typo3.org/extensions/repository/download/solr/3.0.2/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Hendrik Nadler who discovered and reported the vulnerability.