Improper ACL Checks in Joomla! Core Affecting Multiple Versions
CVE-2026-90913

7HIGH

Key Information:

Vendor

Joomla
Status
Joomla! Cms
Vendor
CVE Published:
29 September 2026

What is CVE-2026-90913?

An improper access control vulnerability exists in the Joomla! Core that allows unauthorized users to perform mutation actions via webservice endpoints. This issue affects Joomla versions 4.0.0 through 5.4.8 and 6.0.0 through 6.1.3, potentially exposing sensitive data and allowing malicious users to manipulate content or settings. It’s crucial for users of these affected versions to apply security patches to mitigate the risks associated with this vulnerability.

Affected Version(s)

Joomla! CMS 4.0.0-5.4.8

Joomla! CMS 6.0.0-6.1.3

References

https://www.joomla.org/
product
https://developer.joomla.org/security-centre/1083-2026090...
vendor-advisory

CVSS V4

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

sec-reex
.