Failing to sanitize content from editors, the link validator component is susceptible to Cross-Site Scripting. A valid editor account with access to content which is scanned by the link validator component is required to exploit this vulnerability.

References

• https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2016-02-16-2.yaml
• https://typo3.org/security/advisory/typo3-core-sa-2016-002
• https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2016-002