What’s Vulnerable › Vulnerabilities

CVE-2020-13485

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-05-25 · updated 2026-06-17
• Weakness: CWE-697

Description

The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.

Affected products

• verbb Knock Knock: before 1.2.8 — fixed in 1.2.8

How to fix

Upgrade to a fixed version: verbb Knock Knock 1.2.8. Check the vendor advisory for mitigations.

References

• https://github.com/verbb/knock-knock/blob/craft-3/CHANGELOG.md
• https://limpidsecurity.pl/security-advisories/1/knock-knock-plugin-for-craft-cms/
• https://github.com/verbb/knock-knock/blob/craft-3/CHANGELOG.md
• https://limpidsecurity.pl/security-advisories/1/knock-knock-plugin-for-craft-cms/

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