TYPO3 is an open source PHP based web content management system released under the GNU GPL. In affected versions failing to properly parse, sanitize and encode malicious rich-text content, the content rendering process in the website frontend is vulnerable to cross-site scripting. Corresponding rendering instructions via TypoScript functionality HTMLparser does not consider all potentially malicious HTML tag & attribute combinations per default. In default scenarios, a valid backend user account is needed to exploit this vulnerability. In case custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required. Update to TYPO3 versions 7.6.53 ELTS, 8.7.42 ELTS, 9.5.29, 10.4.19, 11.3.2 that fix the problem described.
| Software | From | Fixed in |
|---|---|---|
| typo3 / typo3 | 9.0.0 | 9.5.28.x |
| typo3 / typo3 | 11.0.0 | 11.3.1.x |
| typo3 / typo3 | 10.0.0 | 10.4.18.x |
| typo3 / typo3 | 7.0.0 | 7.6.52.x |
| typo3 / typo3 | 8.0.0 | 8.7.41.x |
typo3 / cms-core
|
7.0.0 | 7.6.53 |
typo3 / cms-core
|
8.0.0 | 8.7.42 |
typo3 / cms-core
|
9.0.0 | 9.5.29 |
typo3 / cms-core
|
10.0.0 | 10.4.19 |
typo3 / cms-core
|
11.0.0 | 11.3.2 |