What is CVE-2020-23239?

CVE-2020-23239 is a medium-severity vulnerability in Textpattern, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-07-26.

How severe is CVE-2020-23239?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Textpattern

CVE-2020-23239

Cross Site Scripting (XSS) vulnerability in Textpattern CMS 4.8.1 via Custom fields in the Menu Preferences feature.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Textpattern — versions 4.8.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/textpattern/textpattern/issues/1495 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23239?: CVE-2020-23239 is a medium-severity vulnerability in Textpattern, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-07-26.
How severe is CVE-2020-23239?: Medium severity. CVSS v3 base score is 4.8 out of 10.