GHSA-wp8j-c736-c5r3
MEDIUMTYPO3 Cross-Site Scripting Vulnerability Exploitable by Editors
Blast Radius
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 link tags generated by typolink functionality in the website's frontend are vulnerable to cross-site scripting - values being assigned to HTML attributes have not been parsed correctly. A valid backend user account is needed to exploit this vulnerability.
As second and separate vulnerability in the filelist module of the backend user interface has been referenced with this advisory as well. Error messages being shown after using a malicious name for renaming a file are not propery encoded, thus vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3/cms | ≥ 6.2.0&&< 6.2.14 | 6.2.14 |
| 🐘Packagist | typo3/cms | ≥ 7.0.0&&< 7.3.1 | 7.3.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update typo3/cms to 6.2.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wp8j-c736-c5r3 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 pinpoints whether GHSA-wp8j-c736-c5r3 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-wp8j-c736-c5r3. 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-wp8j-c736-c5r3 in your dependencies?
O3 detects GHSA-wp8j-c736-c5r3 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.