What is CVE-2026-23899?

CVE-2026-23899 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-04-01.

How severe is CVE-2026-23899?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Joomla Joomla\!

CVE-2026-23899

An improper access check allows unauthorized access to webservice endpoints.

EPSS: 0.004 (32.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 4.0.0-5.4.3, 6.0.0-6.0.3

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security@joomla.org (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-23899?: CVE-2026-23899 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-04-01.
How severe is CVE-2026-23899?: High severity. CVSS v3 base score is 8.8 out of 10.