CVE-2026-19418
TYPO3 CMS - Broken Access Control in Backend and Install Tool
The referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site's main entry script instead of the dedicated typo3/ directory. Whether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints. Attackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.
| CWE | CWE-346 CWE-352 |
| Vendor | typo3 |
| Product | typo3 cms |
| Published | Aug 11, 2026 |
| Last Updated | Aug 11, 2026 |
Get instant alerts for typo3 typo3 cms
Be the first to know when new unknown vulnerabilities affecting typo3 typo3 cms are published โ delivered to Slack, Telegram or Discord.