Improper CORS Origin Validation in Joomla! Core by Joomla
CVE-2026-71573

6.9MEDIUM

Key Information:

Vendor

Joomla
Status
Joomla! Cms
Vendor
CVE Published:
18 August 2026

What is CVE-2026-71573?

Joomla! Core versions 4.0.0 to 5.4.7 and 6.0.0 to 6.1.2 are affected by an insufficient validation of CORS origins, which could allow attackers to bypass restrictions and initiate unauthorized requests to the service, potentially exposing sensitive data or enabling other malicious actions. This vulnerability arises from improper implementation that fails to verify configured CORS origins adequately within incoming requests.

Affected Version(s)

Joomla! CMS 4.0.0-5.4.6

Joomla! CMS 6.0.0-6.1.2

References

https://www.joomla.org/
product
https://developer.joomla.org/security-centre/20260802-cor...
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Agamemnon Fakas
caveeroo
.