EUVD-2026-61033
GHSA-cmwh-3gg6-hvmv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible API requiring high-privilege authentication; limited to low confidentiality and integrity impact on the vulnerable system with no scope change.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
Lifecycle Timeline
2DescriptionCVE.org
Joomla! Core - [20260804] - Improper ACL checks for custom fields webservice endpoints in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper access check allows unauthorized users to create fields for inaccessible components.
AnalysisAI
Improper access control (CWE-284) in the custom fields webservice API of Joomla! CMS 4.0.0-5.4.7 and 6.0.0-6.1.2 allows authenticated high-privilege users to create custom fields for components whose ACL restrictions should deny them access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session with high-privilege Joomla credentials (confirmed by PR:H in the CVSS 4.0 vector) - unauthenticated actors cannot exploit this flaw. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N, score 5.1) appropriately reflects medium-low real-world severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Administrators should upgrade Joomla! … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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