CVE-2010-3673 is a medium-severity (CVSS 5.3) Information Exposure vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.
TYPO3 is vulnerable to Information Disclosure in the HTML mailing API
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
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
TYPO3 before 4.2.13, 4.3.x before 4.3.4 and 4.4.x before 4.4.1 allows information disclosure in the mail header of the HTML mailing API.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3/cms-core | all versions | 4.2.13composer require typo3/cms-core:^4.2.13 |
| 🐘Packagist | typo3/cms-core | ≥ 4.3&&< 4.3.4 | 4.3.4composer require typo3/cms-core:^4.3.4 |
| 🐘Packagist | typo3/cms-core | ≥ 4.4&&< 4.4.1 | 4.4.1composer require typo3/cms-core:^4.4.1 |
Affected Products
typo3typo3Detection & 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 4.2.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2010-3673 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.
Frequently Asked Questions
Is CVE-2010-3673 in your dependencies?
Find it across Packagist, including transitive dependencies.