EUVD-2026-66866
GHSA-gh3c-9wwf-mj2v
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Administrator-only file-write feature forces PR:H; network-reachable admin UI with no user interaction gives AV:N/UI:N; RCE yields full C/I/A within the host, so scope kept Unchanged absent evidence of cross-component impact.
Primary rating from Vendor (joomla).
CVSS VectorVendor: joomla
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Lifecycle Timeline
2DescriptionCVE.org
Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1 - The administrator source model allows to write dangerous file type incl. PHP, leading to remote code execution.
AnalysisAI
Arbitrary PHP file upload leading to remote code execution in the Joomla Event Manager extension (joomlaeventmanager.net) versions before 5.0.1 allows an authenticated administrator to write dangerous file types through the administrator source model and execute code on the underlying server. The flaw is a CWE-434 unrestricted upload weakness that turns legitimate back-end file-handling into a webshell delivery path; no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Joomla administrator session (CVSS PR:H) with access to the Event Manager extension's administrator 'source' model file-write function - this is the exact feature that permits saving dangerous file types including PHP. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately consistent but not maximal. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained or been granted Joomla administrator credentials logs into the back end, navigates to the Event Manager's administrator source functionality, and uses its file-write capability to save a malicious PHP file (a webshell) into a web-reachable directory. They then request that file over HTTP to execute arbitrary commands as the web server user, achieving full server compromise. … |
| Remediation | Upgrade the Joomla Event Manager extension to version 5.0.1 or later, which is the fixed release implied by the '< 5.0.1' affected range (Vendor-released patch: 5.0.1); obtain it from the vendor at https://www.joomlaeventmanager.net/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Immediately identify all Joomla installations using the Event Manager extension and disable it to prevent exploitation. …
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Same technique File Upload
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External POC / Exploit Code
Leaving vuln.today