CVE-2020-36844Public exploitNetwork attack vector

Browser script execution via decoded demonstration-page URL path

Published Apr 20, 2025 · Updated Apr 21, 2025

Reflected XSS in KnowBe4 Security Awareness Training before 2020-01-10 allows remote attackers to execute JavaScript via a crafted link. The phishing demonstration page decodes attacker-controlled data from its URL path and places a JavaScript URL in a script assignment to window.location.href without neutralization. A victim must open the malicious link, after which the script runs in the application's browser origin and can read or alter data available to that session.

CVSS severity6.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in KnowBe4 Security Awareness Training before 2020-01-10 allows remote attackers to execute JavaScript via a crafted link. The phishing demonstration page decodes attacker-controlled data from its URL path and places a JavaScript URL in a script assignment to window.location.href without neutralization. A victim must open the malicious link, after which the script runs in the application's browser origin and can read or alter data available to that session.

The record

CVE
CVE-2020-36844
Published
Apr 20, 2025
Updated
Apr 21, 2025
Vendor
KnowBe4
Product
Security Awareness Training
Classifications
CWE-79, T1059.007, T1204.001
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

6.1MITRECVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript
T1204.001Malicious Link

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo