CVE-2020-7700
CRITICALCVE-2020-7700 is a critical-severity (CVSS 9.8) CWE-1321 vulnerability in phpjs. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether CVE-2020-7700 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Prototype Pollution in phpjs
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
phpjsnpmDescription
All versions of phpjs up to and including 1.3.2 are vulnerable to Prototype Pollution via parse_str. phpjs is no longer maintained and users are advised to use Locutus as a replacement (https://github.com/locutusjs/locutus)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | phpjs | all versions | No fix |
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 phpjs. 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.
Remediation status
No patched version of phpjs has shipped for CVE-2020-7700 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
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-2020-7700 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-2020-7700. 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-2020-7700 in your dependencies?
O3 detects CVE-2020-7700 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.