CVE-2019-10911 is a high-severity (CVSS 7.5) Improper Authentication vulnerability in symfony/security-http. O3 Security confirms whether CVE-2019-10911 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Improper authentication in Symfony
Real-World Exposure
symfony/security-http🐘symfony/security-http🐘symfony/security-http🐘symfony/security-http🐘symfony/security-http🐘symfony/security🐘symfony/security🐘symfony/security+7 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
In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, a vulnerability would allow an attacker to authenticate as a privileged user on sites with user registration and remember me login functionality enabled. This is related to symfony/security.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | symfony/security-http | ≥ 2.7.0&&< 2.7.51 | 2.7.51 |
| 🐘Packagist | symfony/security-http | ≥ 2.8.0&&< 2.8.50 | 2.8.50 |
| 🐘Packagist | symfony/security-http | ≥ 3.0.0&&< 3.4.26 | 3.4.26 |
| 🐘Packagist | symfony/security-http | ≥ 4.0.0&&< 4.1.12 | 4.1.12 |
| 🐘Packagist | symfony/security-http | ≥ 4.2.0&&< 4.2.7 | 4.2.7 |
| 🐘Packagist | symfony/security | ≥ 2.7.0&&< 2.7.51 | 2.7.51 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/security-http. 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 symfony/security-http to 2.7.51 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-10911 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-2019-10911 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-2019-10911. 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-2019-10911 in your dependencies?
O3 detects CVE-2019-10911 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.