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CVE-2026-77989— Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events 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 Events Manager < 5.0.1 中通过 PDF 导出链接实现的反射型 XSS 漏洞：buildCurrentPdfLink 函数将当前请求的查询字符串复制到 PDF 按钮的 URL 中，而 pdfbutton() 函数在未进行转义的情况下直接输出（echo）该字符串，从而形成了反射型 XSS 漏洞。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-77989

Vulnerability Information
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Vulnerability Title
Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1
Source: CVE Program / CVE List V5
Vulnerability Description
Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() echoes it unescaped, leading to an reflected XSS vector.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
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-2026-77989

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III. Intelligence Information for CVE-2026-77989

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Vendor Pages for CVE-2026-77989 (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-2026-77035 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-79

V. Comments for CVE-2026-77989

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