TYPO3 Information Disclosure in Install ToolGHSA-66c2-7g4p-wx4p
MEDIUMGHSA-66c2-7g4p-wx4p is a medium-severity (CVSS 5.3) vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.
Real-World Exposure
typo3/cms-core🐘typo3/cms-core🐘typo3/cms-coreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
The Install Tool exposes the current TYPO3 version number to non-authenticated users.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3/cms-core | ≥ 8.0.0&&< 8.7.21 | 8.7.21composer require typo3/cms-core:^8.7.21 |
| 🐘Packagist | typo3/cms-core | ≥ 9.0.0&&< 9.5.2 | 9.5.2composer require typo3/cms-core:^9.5.2 |
| 🐘Packagist | typo3/cms-core | ≥ 7.0.0&&< 7.6.32 | 7.6.32composer require typo3/cms-core:^7.6.32 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update typo3/cms-core to 8.7.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-66c2-7g4p-wx4p is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is GHSA-66c2-7g4p-wx4p in your dependencies?
Find it across Packagist, including transitive dependencies.