Unrestricted file upload in joomlaeventmanager.net JEM - Joomla Event Manager extension…
Priority MEDIUM 43CWE-434Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-434.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00642 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| joomlaeventmanager.net | JEM - Joomla Event Manager extension for Joomla | 1.0.0-5.0.0 | — | No fix listed | CNA |
- JEM - Joomla Event Manager extension for Joomla Vendorjoomlaeventmanager.net Affected 1.0.0-5.0.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77991
- 2026-10-03 Alias added: GHSA-gh3c-9wwf-mj2v
- 2026-10-21 EPSS moved to the 50th–90th percentile
References
More joomlaeventmanager.net vulnerabilities
- TI-2026-53813 Improper access control in joomlaeventmanager.net JEM - Joomla Event Manager extension… CVSS 4.0MEDIUM 6.9
- TI-2026-54264 Cross-site scripting in joomlaeventmanager.net JEM - Joomla Event Manager extension for… CVSS 4.0MEDIUM 5.3
- TI-2026-54265 Authorization bypass in joomlaeventmanager.net JEM - Joomla Event Manager extension for… CVSS 4.0MEDIUM 5.3
- TI-2026-53814 Authorization bypass in joomlaeventmanager.net JEM - Joomla Event Manager extension for… CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-77991 · CVE Program
- CVE-2026-77991 · NVD
- FIRST EPSS
- GHSA-gh3c-9wwf-mj2v · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences