What is CVE-2024-40743?

CVE-2024-40743 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2024-08-20.

How severe is CVE-2024-40743?

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

Is CVE-2024-40743 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Joomla Joomla\!

CVE-2024-40743

The stripImages and stripIframes methods didn't properly process inputs, leading to XSS vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-08-20 · 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: 0.003 (17.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.0% 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: 0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 3.0.0-3.10.16, 4.0.0-4.4.6, 5.0.0-5.1.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

developer.joomla.org/security-centre/946-20240805-core-xss-vectors-in-outputfil… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-40743?: CVE-2024-40743 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2024-08-20.
How severe is CVE-2024-40743?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2024-40743 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.