GHSA-2fx5-pggv-6jjr
MEDIUMTYPO3 Potential Open Redirect via Parsing Differences
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
typo3/cms-core🐘typo3/cms-core🐘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
Problem
Applications that use TYPO3\CMS\Core\Http\Uri to parse externally provided URLs (e.g., via a query parameter) and validate the host of the parsed URL may be vulnerable to open redirect or SSRF attacks if the URL is used after passing the validation checks.
Solution
Update to TYPO3 versions 9.5.49 ELTS, 10.4.48 ELTS, 11.5.42 ELTS, 12.4.25 LTS, 13.4.3 LTS that fix the problem described.
Credits
Thanks to Sam Mush and Christian Eßl who reported this issue and to TYPO3 core & security team member Benjamin Franzke who fixed the issue.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3/cms-core | ≥ 9.0.0&&< 9.5.49 | 9.5.49 |
| 🐘Packagist | typo3/cms-core | ≥ 10.0.0&&< 10.4.48 | 10.4.48 |
| 🐘Packagist | typo3/cms-core | ≥ 11.0.0&&< 11.5.42 | 11.5.42 |
| 🐘Packagist | typo3/cms-core | ≥ 12.0.0&&< 12.4.25 | 12.4.25 |
| 🐘Packagist | typo3/cms-core | ≥ 13.0.0&&< 13.4.3 | 13.4.3 |
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. 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-core to 9.5.49 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2fx5-pggv-6jjr 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-2fx5-pggv-6jjr 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-2fx5-pggv-6jjr. 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-2fx5-pggv-6jjr in your dependencies?
O3 detects GHSA-2fx5-pggv-6jjr across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.