GHSA-wxvr-qqm7-6h65: verbb/knock-knock (CVE-2020-13485)

Knock Knock plugin IP Whitelist bypass via an X-Forwarded-For HTTP header

CVSS 9.1 CriticalCriticalEPSS 0.014 · 71st percentile

Critical, because:

CVSS score 9.1: 9.0 or more.

Published by the GitHub Advisory Database at 24 May 2022, 17:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
verbb/knock-knock	Packagist	<1.2.8	1.2.8

Identifiers

GHSA-wxvr-qqm7-6h65 · CVE-2020-13485 · PKSA-m63z-24sm-jgzh

Weakness (CWE)

CWE-697

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The Knock Knock plugin for Craft CMS, versions before 1.2.8, can be bypassed through the IP whitelist by sending a crafted X-Forwarded-For HTTP header. An attacker with network access to the site can use this to get past the IP restriction. The source gives few details beyond this. Upgrade the verbb/knock-knock package to version 1.2.8 or later.

Written 4 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.1	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS 0.014, the 71st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:30 UTC First seen by agentprime
31 Oct 2026, 14:30 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.