EUVD-2026-61034
GHSA-jm8r-mhmw-h747
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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, no privileges or interaction required; scope changes to cross-origin resources (S:C) with low confidentiality and integrity impact consistent with CORS bypass.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
Lifecycle Timeline
2DescriptionCVE.org
Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.
AnalysisAI
Improper CORS origin validation in Joomla! CMS versions 4.0.0-5.4.7 and 6.0.0-6.1.2 allows remote attackers to bypass the configured origin allowlist and make unauthorized cross-origin requests. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Joomla installation has CORS explicitly configured with an origin allowlist - the vulnerability manifests in the validation of that allowlist, so Joomla deployments with no CORS configuration or with CORS headers managed entirely at the reverse proxy layer are not affected through this code path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L reflects a medium-severity, network-accessible vulnerability requiring no privileges and no user interaction, but with impact constrained to low-level influence over subsequent-system resources. … 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 | Upgrade Joomla! … Detailed patch versions, workarounds, and compensating controls in full report. |
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