CVE-2026-48955: 
Joomla vulnerability analysis and mitigation

CVE-2026-48955 is an improper access control vulnerability in Joomla! CMS that allows unauthorized users to access workflow stage and transition information. It affects Joomla! versions 6.0.0 through 6.1.1 and was published on July 7, 2026, with a patch advisory released July 9, 2026. The vulnerability is classified as CWE-284 (Improper Access Control) and carries a CVSS v3.1 base score of 6.5 (Medium) and a CVSS v4.0 base score of 6.4 (Medium) (GitHub Advisory, Joomla Advisory).

The vulnerability resides in Joomla!'s com_workflow component, where insufficient access checks allow authenticated (or potentially unauthenticated) users to retrieve workflow stage and transition data that should be restricted to authorized roles. Classified as CWE-284 (Improper Access Control), the flaw is exploitable over the network with low attack complexity and requires no user interaction. The CVSS v3.1 scoring indicates low privileges are required, while the CVSS v4.0 vector suggests high privileges in the vulnerable system context but high subsequent system impact, reflecting the potential for broader information disclosure beyond the immediate component (GitHub Advisory, Joomla Advisory).

Successful exploitation results in unauthorized disclosure of workflow stage and transition information, representing a high confidentiality impact at the network level. While integrity and availability of the directly vulnerable system are not affected, the CVSS v4.0 scoring indicates high subsequent system confidentiality, integrity, and availability impact, suggesting that exposed workflow data could facilitate further attacks or process manipulation. This information disclosure could allow attackers to map internal content workflows, identify approval processes, and potentially craft targeted attacks against content management operations (GitHub Advisory, Joomla Advisory).

Joomla! has released a patch addressing this vulnerability; users should upgrade to Joomla! 6.1.2 or later, which resolves the incorrect access control in com_workflow (Joomla Advisory). As an interim measure, administrators should review and tighten access control settings for workflow-related functionality within the Joomla! backend, restricting access to trusted roles only. Monitoring access logs for unusual or unauthorized requests to workflow endpoints is also recommended.

The vulnerability received routine coverage from vulnerability tracking services including VulDB, CVEFeed, and ENISA's EUVD shortly after disclosure. The Italian GARR CERT issued a security alert referencing the Joomla! update. Tenable added detection plugins for the vulnerability. No significant researcher commentary or notable social media discussion beyond automated CVE notification accounts has been observed.