CVE-2026-90916
[20260906] - Core - Improper ACL checks in content history comparison view
Published Sep 25, 2026 · Joomla Joomla · evidence confidence high
Project: Joomla! SubProject: CMS Impact: Low Severity: Low Probability: Low Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: Incorrect Access Control Reported Date: 2026-07-15 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90916 Description An improper access check allows unauthorized users to view inaccessible contents. Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3 Solution Upgrade to version 5.4.9, 6.1.4 Contact The JSST at the Joomla! Security Centre . Reported By: Arkadiusz Marta
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-90916 is a unknown public vulnerability record for Joomla Joomla. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Joomla Joomla is in your estate, then compare installed versions with the affected ranges. Affected version ranges have not been ingested yet. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: no CVSS/EPSS yet. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: cve_org, joomla. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 25, 2026 · Joomla Security
Detected
Project: Joomla! SubProject: CMS Impact: Low Severity: Low Probability: Low Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: Incorrect Access Control Reported Date: 2026-07-15 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90916 Description An improper access check allows unauthorized users to view inaccessible contents. Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3 Solution Upgrade
Sources
- CVE.orgVulnerability recordCVE-2026-90916
Official CVE identifier
cve.org - Joomla SecurityVendor advisoryCVE-2026-90916
Project: Joomla! SubProject: CMS Impact: Low Severity: Low Probability: Low Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: Incorrect Access Control Reported Date: 2026-07-15 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90916 Description An improper access check allows unauthorize
developer.joomla.org