Improper Access Control in Joomla! Core Affects Multiple Versions
CVE-2026-90917

6.9MEDIUM

Key Information:

Vendor

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

What is CVE-2026-90917?

An access control flaw in the Joomla! Core allows unauthorized users to view content items categorized as inaccessible. This affects multiple versions of Joomla from 4.0.0 to 6.1.3, making it crucial for site administrators to implement immediate security measures. The improper ACL checks in outputs for tagged items could lead to sensitive information being exposed, hence reinforcing the need for regular security audits and updates.

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/1087-2026090...
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
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

Sabuhi Mammadov
.