Medium 6.9Published Aug 18, 2026

CVE-2026-71573Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2

Updated under an hour ago (Oct 28, 2026, 4:23 AM ET)

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It affects Joomla! Project Joomla! CMS and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

CVSS: 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
Weakness (CWE): CWE-93
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Joomla
NVD analysis: Analyzed
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Joomla! Project Joomla! CMS joomla_project:joomla_cms (from the name)	4.0.0-5.4.6; 6.0.0-6.1.2	CNA record
joomla joomla! joomla:joomla!	from 4.0.0 before 5.4.8; from 6.0.0 before 6.1.3	NVD

References

References

https://www.joomla.org/	product
https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html	vendor-advisory, broken-link

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.