CVE-2020-36845Public exploitNetwork attack vector

Phishing redirects via unvalidated demonstration-page URL path

Published Apr 20, 2025 · Updated Apr 21, 2025

Open redirect in KnowBe4 Security Awareness Training before 2020-01-10 allows remote attackers to send users to arbitrary HTTPS sites. The phishing demonstration page decodes its URL path into a redirect target and writes that unvalidated value to window.location.href. A victim must follow a crafted link; the redirect can lend a trusted KnowBe4 URL to phishing that leads to an attacker-controlled site.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in KnowBe4 Security Awareness Training before 2020-01-10 allows remote attackers to send users to arbitrary HTTPS sites. The phishing demonstration page decodes its URL path into a redirect target and writes that unvalidated value to window.location.href. A victim must follow a crafted link; the redirect can lend a trusted KnowBe4 URL to phishing that leads to an attacker-controlled site.

The record

CVE
CVE-2020-36845
Published
Apr 20, 2025
Updated
Apr 21, 2025
Vendor
KnowBe4
Product
Security Awareness Training
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2020-01-10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KnowBe4 · Security Awareness Trainingversion=0 <2020-01-10

Published CVSS scores

5.3MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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