Medium severity · published Sep 29, 2026
CVE-2026-90917
Joomla! Core - [20260907] - Core - Improper ACL checks in outputs for tagged items in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
Joomla! Core - [20260907] - Core - Improper ACL checks in outputs for tagged items in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to view content items from inaccessible categories.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JO
Joomla · Joomla
4.0.0-5.4.8; 6.0.0-6.1.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90917
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90917
product
https://www.joomla.org/
vendor-advisory
https://developer.joomla.org/security-centre/1087-20260907-core-improper-acl-checks-in-outputs-for-tagged-items.html
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