What is CVE-2021-26032?

CVE-2021-26032 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-26.

How severe is CVE-2021-26032?

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

XSS in Joomla Joomla\!

CVE-2021-26032

An issue was discovered in Joomla! 3.0.0 through 3.9.26. HTML was missing in the executable block list of MediaHelper::canUpload, leading to XSS attack vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-05-26 · 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 (55.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% 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 3.0.0-3.9.26

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

developer.joomla.org/security-centre/852-20210501-core-adding-html-to-the-execu… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26032?: CVE-2021-26032 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-26.
How severe is CVE-2021-26032?: Medium severity. CVSS v3 base score is 6.1 out of 10.