What’s Vulnerable › Vulnerabilities

CVE-2020-28481: Insecure Defaults

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-19 · updated 2026-06-17
• Weakness: CWE-346

Description

The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.

Affected products

• socketio socket.io: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: socketio socket.io 2.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/socketio/socket.io/issues/3671
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1056358
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1056357
• https://snyk.io/vuln/SNYK-JS-SOCKETIO-1024859
• https://github.com/socketio/socket.io/issues/3671
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1056358
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1056357
• https://snyk.io/vuln/SNYK-JS-SOCKETIO-1024859

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