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CVE-2026-77035— Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through forged form fields 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 5.0.1 之前版本中，通过伪造表单字段可跨用户接管事件和场地 - 拥有“编辑自己”权限的注册用户（设置 或核心权限 ），可以在提交表单时，将其他用户的记录 ID 与自己的 ID 作为 字段一并提交，从而接管该条记录。

CVSS 5.1 · Medium
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I. Basic Information for CVE-2026-77035

Vulnerability Information
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Vulnerability Title
Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through forged form fields in Joomla Event Manager < 5.0.1
Source: CVE Program / CVE List V5
Vulnerability Description
Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through forged form fields in Joomla Event Manager < 5.0.1 - A registered user with edit-own rights (the eventowner=1 setting or core.edit.own) can POST another user's record id together with their own id as created_by and take over that record.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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-2026-77035

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77035

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Vendor Pages for CVE-2026-77035 (1)

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

CVE-2026-77991 9.4 CRITICAL Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Eve
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

IV. Related Vulnerabilities

Same product: JEM - Joomla Event Manager extension for Joomla
Same vendor: joomlaeventmanager.net
Same weakness: CWE-639

V. Comments for CVE-2026-77035

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