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Not in CISA KEV
MEDIUM severity

CVE-2020-13486 — knock-knock

MEDIUM

CVE-2020-13486 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in verbb/knock-knock. A fix is available for verbb/knock-knock — see the affected versions and patch details below.

Knock Knock plugin Open redirection vulnerability

Also known asGHSA-m69r-4h68-xq7j
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk
0.00%0.39%0.79%1.18%0.2%0.7%May 26Aug 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘verbb/knock-knock

Real-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

The Knock Knock plugin before 1.2.8 for Craft CMS allows malicious redirection.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistverbb/knock-knockall versions1.2.8composer require verbb/knock-knock:^1.2.8

Affected Products

1 product · 1 configurations
Application
knock knockverbb
< 1.2.8
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for verbb/knock-knock, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update verbb/knock-knock to 1.2.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-13486 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

The Knock Knock plugin before 1.2.8 for Craft CMS allows malicious redirection.
O3 Security · Impact-Aware SCA

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CVE-2020-13486: knock-knock — Fixed in 1.2.8