CVE-2020-23239Public exploitNetwork attack vector

Stored XSS via unescaped custom-field names

Published Jul 26, 2021 · Updated Aug 4, 2024

Stored XSS in Textpattern CMS 4.8.1 allows remote authenticated users to execute script in a user's browser through custom-field names. The Menu Preferences form accepts an HTML event-handler payload as a custom-field name, stores it, and renders it without neutralization when the Textpattern icon is selected. Administrative access is required to save the field name, and a user must interact with the affected interface; successful exploitation permits browser-context actions such as reading session data or redirecting the victim.

CVSS severity4.8
Medium
EPSS probability0.51%
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 Textpattern CMS 4.8.1 allows remote authenticated users to execute script in a user's browser through custom-field names. The Menu Preferences form accepts an HTML event-handler payload as a custom-field name, stores it, and renders it without neutralization when the Textpattern icon is selected. Administrative access is required to save the field name, and a user must interact with the affected interface; successful exploitation permits browser-context actions such as reading session data or redirecting the victim.

The record

CVE
CVE-2020-23239
Published
Jul 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 26, 2021CVE 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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