CVE-2017-20027Public exploitNetwork attack vector

Script execution via unsanitized pasted rich text

Published Jun 9, 2022 · Updated Apr 15, 2025

DOM cross-site scripting in HumHub 1.0.0 and 1.0.1 allows remote attackers to execute script in a user's browser through rich-text input. The rich-text editor accepts pasted HTML tags without neutralizing script-capable markup before the browser adds it to the page. Exploitation requires a user to paste attacker-supplied HTML into the editor, limiting execution to that user's HumHub browser context.

CVSS severity4.3
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM cross-site scripting in HumHub 1.0.0 and 1.0.1 allows remote attackers to execute script in a user's browser through rich-text input. The rich-text editor accepts pasted HTML tags without neutralizing script-capable markup before the browser adds it to the page. Exploitation requires a user to paste attacker-supplied HTML into the editor, limiting execution to that user's HumHub browser context.

The record

CVE
CVE-2017-20027
Published
Jun 9, 2022
Updated
Apr 15, 2025
Vendor
HumHub GmbH & Co. KG
Product
HumHub
Classifications
CWE-80, T1204.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=1.0.0
  2. Affected versionversion=1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HumHub GmbH & Co. KG · HumHubversion=1.0.0; version=1.0.1

Published CVSS scores

4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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.

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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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1204.004Malicious Copy and Paste

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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