GHSA-v8m4-3w37-ghxx is a medium-severity (CVSS 6.1) vulnerability in typo3/cms. A fix is available for typo3/cms — see the affected versions and patch details below.
TYPO3 Cross-Site Scripting in Form Framework validation handling
Real-World Exposure
typo3/cms🐘typo3/cms🐘typo3/cmsReal-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
It has been discovered that the output of field validation errors in the Form Framework is vulnerable to cross-site scripting.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3/cms | ≥ 10.0.0&&< 10.2.1 | 10.2.1composer require typo3/cms:^10.2.1 |
| 🐘Packagist | typo3/cms | ≥ 8.0.0&&< 8.7.30 | 8.7.30composer require typo3/cms:^8.7.30 |
| 🐘Packagist | typo3/cms | ≥ 9.0.0&&< 9.5.12 | 9.5.12composer require typo3/cms:^9.5.12 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update typo3/cms to 10.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v8m4-3w37-ghxx 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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-v8m4-3w37-ghxx can be triaged on real exposure rather than presence alone.
Tailored to GHSA-v8m4-3w37-ghxx. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-v8m4-3w37-ghxx in your dependencies?
O3 Security finds GHSA-v8m4-3w37-ghxx across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.