Improper Access Control in Joomla! Core Affects Multiple Versions
CVE-2026-90916

5.1MEDIUM

Key Information:

Vendor

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

What is CVE-2026-90916?

Joomla! Core suffers from an improper access control vulnerability that compromises the content history comparison view. This flaw enables unauthorized users to gain visibility into potentially sensitive content that should remain restricted. Affected versions include 4.0.0 through 5.4.8 and 6.0.0 through 6.1.3. Website administrators are strongly urged to take immediate action to secure their installations against 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/1086-2026090...
vendor-advisory

CVSS V4

Score:
5.1
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

Arkadiusz
.