CVE-2020-15241 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in typo3fluid/fluid. 2 public exploit references exist, so weaponization risk is real. O3 Security confirms whether CVE-2020-15241 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Cross-Site Scripting in ternary conditional operator
Real-World Exposure
typo3fluid/fluid🐘typo3fluid/fluid🐘typo3fluid/fluid🐘typo3fluid/fluid🐘typo3fluid/fluid🐘typo3fluid/fluid🐘typo3fluid/fluid🐘typo3/cms-core+3 moreReal-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 Fluid Engine (package typo3fluid/fluid) before versions 2.0.5, 2.1.4, 2.2.1, 2.3.5, 2.4.1, 2.5.5 or 2.6.1 is vulnerable to cross-site scripting when making use of the ternary conditional operator in templates like {showFullName ? fullName : defaultValue}. Updated versions of this package are bundled in following TYPO3 (typo3/cms-core) versions as well: TYPO3 v8.7.25 (using typo3fluid/fluid v2.5.4) and TYPO3 v9.5.6 (using typo3fluid/fluid v2.6.1).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | typo3fluid/fluid | ≥ 2.0.0&&< 2.0.5 | 2.0.5 |
| 🐘Packagist | typo3fluid/fluid | ≥ 2.1.0&&< 2.1.4 | 2.1.4 |
| 🐘Packagist | typo3fluid/fluid | ≥ 2.2.0&&< 2.2.1 | 2.2.1 |
| 🐘Packagist | typo3fluid/fluid | ≥ 2.3.0&&< 2.3.5 | 2.3.5 |
| 🐘Packagist | typo3fluid/fluid | ≥ 2.4.0&&< 2.4.1 | 2.4.1 |
| 🐘Packagist | typo3fluid/fluid | ≥ 2.5.0&&< 2.5.5 | 2.5.5 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3fluid/fluid. 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 typo3fluid/fluid to 2.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15241 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 CVE-2020-15241 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 CVE-2020-15241. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2020-15241 in your dependencies?
O3 detects CVE-2020-15241 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.