What is CVE-2021-23125?

CVE-2021-23125 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-12.

How severe is CVE-2021-23125?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Joomla Joomla\!

CVE-2021-23125

An issue was discovered in Joomla! 3.1.0 through 3.9.23. The lack of escaping of image-related parameters in multiple com_tags views cause lead to XSS attack vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 3.1.0-3.9.23

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

developer.joomla.org/security-centre/838-20210103-core-xss-in-com-tags-image-pa… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-23125?: CVE-2021-23125 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-12.
How severe is CVE-2021-23125?: Medium severity. CVSS v3 base score is 6.1 out of 10.