Component Type: TYPO3 CMS
Release Date: December 15, 2015
Vulnerability Type: Cross-Site Scripting
Affected Versions: Versions 6.2.0 to 6.2.15, 7.0.0 to 7.6.0
Severity: Low
Suggested CVSS v2.0: AV:N/AC:L/Au:S/C:N/I:P/A:N/E:F/RL:O/RC:C
CVE: not assigned yet
Problem Description: All link fields within the TYPO3 installation are vulnerable to Cross-Site Scripting as authorized editors can insert javascript commands by using the url scheme "javascript:".
Solution: Update to TYPO3 versions 6.2.16 or 7.6.1 that fix the problem described. By default now the typoLink() function disables the insecure url scheme "javascript:".
Important note: If your TYPO3 installation is in need of that prefix you can re-enable the old behaviour by installing the extension javascript_handler.
Credits: Thanks to Oliver Hader who discovered and reported the issues.
General Advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.
General Note: All security related code changes are tagged so that you can easily look them up on our review system.