GHSA-xgmx-j3hv-jh9x 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 Link 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 t3:// URL handling and typolink functionality are vulnerable to cross-site scripting. Not only regular backend forms are affected but also frontend extensions which use the rendering with typolink.
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-xgmx-j3hv-jh9x 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-xgmx-j3hv-jh9x can be triaged on real exposure rather than presence alone.
Tailored to GHSA-xgmx-j3hv-jh9x. 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-xgmx-j3hv-jh9x in your dependencies?
O3 Security finds GHSA-xgmx-j3hv-jh9x across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.