CVE-2020-28919Public exploitNetwork attack vector

Stored XSS via unfiltered view-title URL scheme

Published Jan 15, 2022 · Updated Aug 4, 2024

Stored XSS in Checkmk 1.6.0p18 and earlier allows remote authenticated users to execute JavaScript through a shared view title. The GUI Escaper selectively unescapes anchor href attributes without rejecting javascript schemes, leaving a crafted title link executable. Exploitation requires permission to configure and share a custom view plus a victim click; the code then runs in the victim's browser context, allowing data access or interface manipulation.

CVSS severity5.4
Medium
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Checkmk 1.6.0p18 and earlier allows remote authenticated users to execute JavaScript through a shared view title. The GUI Escaper selectively unescapes anchor href attributes without rejecting javascript schemes, leaving a crafted title link executable. Exploitation requires permission to configure and share a custom view plus a victim click; the code then runs in the victim's browser context, allowing data access or interface manipulation.

The record

CVE
CVE-2020-28919
Published
Jan 15, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious 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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