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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| typo3/cms-core(Packagist) | 7.0.0 | 7.6.53 | N/A |
| typo3/cms-core(Packagist) | 8.0.0 | 8.7.42 | N/A |
| typo3/cms-core(Packagist) | 10.0.0 | 10.4.19 | N/A |
| typo3/cms-core(Packagist) | 11.0.0 | 11.3.2 | N/A |
| typo3/cms-core(Packagist) | 9.0.0 | 9.5.29 | N/A |
| typo3/cms(Packagist) | 10.0.0 | 10.4.19 | N/A |
| typo3/cms(Packagist) | 11.0.0 | 11.3.2 | N/A |
| typo3/cms(Packagist) | 9.0.0 | 9.5.29 | N/A |
| typo3/cms(Packagist) | 8.0.0 | 8.7.42 | N/A |
| typo3/cms(Packagist) | 7.0.0 | 7.6.53 | N/A |
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