Answer in brief
CVE-2026-19418 records a High severity (CVSS 7.3) vulnerability in TYPO3 CMS - Broken Access Control in Backend and Install Tool. The current sources do not mark it as known exploited. The current feed maps typo3/cms-backend (composer), typo3/cms-core (composer), TYPO3/TYPO3 CMS (generic), TYPO3/TYPO3 CMS (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps typo3/cms-backend (composer), typo3/cms-core (composer), TYPO3/TYPO3 CMS (generic), TYPO3/TYPO3 CMS (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| typo3/cms-backendcomposer | >=13.0.0,<13.4.34 | 13.4.34 |
| typo3/cms-corecomposer | >=14.0.0,<14.3.6 | 14.3.6 |
| TYPO3/TYPO3 CMSgeneric | >=13.0.0 <13.4.34 || >=14.0.0 <14.3.6 | 13.4.34, 14.3.6 |
| TYPO3/TYPO3 CMSgeneric | >=14.0.0 <14.3.6 | 14.3.6 |
| typo3/cms-backendpackagist | >=13.0.0 <13.4.34 | 13.4.34 |
| typo3/cms-corepackagist | >=14.0.0 <14.3.6 | 14.3.6 |
Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.