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CVE-2026-77991— Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1

Quick assessment

Affected
joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joomla 扩展 - joomlaeventmanager.net - Joomla Event Manager 低于 5.0.1 版本存在特权远程代码执行漏洞 - 管理员源模型（Administrator Source Model）允许写入危险的文件类型（包括 PHP），从而导致远程代码执行。

CVSS 9.4 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-77991

Vulnerability Information
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Vulnerability Title
Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla 1.0.0-5.0.0 -

II. Public POCs for CVE-2026-77991

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77991

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Vendor Pages for CVE-2026-77991 (1)

Same Patch Batch · joomlaeventmanager.net · 2026-08-27 · 5 CVEs total

CVE-2026-77034 6.9 MEDIUM Joomla Extension - joomlaeventmanager.net - Unauthenticated article overwrite and force-pu
CVE-2026-77990 5.3 MEDIUM Joomla Extension - joomlaeventmanager.net - Attendee lists readable by any logged-in user
CVE-2026-77989 5.3 MEDIUM Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Jooml
CVE-2026-77035 5.1 MEDIUM Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through fo

IV. Related Vulnerabilities

Same product: JEM - Joomla Event Manager extension for Joomla
Same vendor: joomlaeventmanager.net
Same weakness: CWE-434

V. Comments for CVE-2026-77991

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