What is CVE-2026-73336?

CVE-2026-73336 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-08-18.

How severe is CVE-2026-73336?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Joomla Joomla\!

CVE-2026-73336

Joomla! Core - [20260806] - XSS through schema.org outputs in Joomla 5.1.0-5.4.7, 6.0.0-6.1.2 - Improper escaping flags lead to an XSS vector in schema.org markup outputs.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-08-18 · last modified 2026-09-03.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.001

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 5.1.0-5.4.6, 6.0.0-6.1.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.joomla.org/ (Product, product)
developer.joomla.org/security-centre/1073-20260806-core-xss-through-schema-org-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-73336?: CVE-2026-73336 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-08-18.
How severe is CVE-2026-73336?: Medium severity. CVSS v3 base score is 6.4 out of 10.