How severe is CVE-2020-13486?

CVE-2020-13486 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-13486 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13486?

CVE-2020-13486 affects Verbb Knock Knock. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13486?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-13486 published?

CVE-2020-13486 was published on 2020-05-25 and last updated on 2026-06-17.

CVE-2020-13486

CVE-2020-13486 is a medium-severity vulnerability in Verbb Knock Knock with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Verbb Knock Knock
Published: 2020-05-25
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2020-13486?: The Knock Knock plugin before 1.2.8 for Craft CMS allows malicious redirection.
How severe is CVE-2020-13486?: CVE-2020-13486 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-13486 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13486?: CVE-2020-13486 affects Verbb Knock Knock. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13486?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-13486 published?: CVE-2020-13486 was published on 2020-05-25 and last updated on 2026-06-17.

References

https://github.com/verbb/knock-knock/blob/craft-3/CHANGELOG.md

Affected products (1)

cpe:2.3:a:verbb:knock_knock:*:*:*:*:*:craft_cms:*:*

More vulnerabilities in Verbb Knock Knock

CVE-2020-13485 — Critical (CVSS 9.1): The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.

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