CVE-2026-77989 MEDIUM

CVE-2026-77989: Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1

Vendor Joomlaeventmanager.net
Product JEM - Joomla Event Manager extension for Joomla
Weakness CWE-79 · XSS
Published August 27, 2026
Last update August 27, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

JEM - Joomla Event Manager contains a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into the application. An attacker can craft a malicious link or page that, when visited by a site user, executes arbitrary JavaScript in the victim's browser. This can lead to session hijacking, credential theft, or defacement of site content.

What an attacker can do

03Attacker Capabilities

Inject and execute malicious JavaScript in a user's browser to steal session cookies or credentials.

Potential impact on your site

04Site Impact

Site visitors' sessions and login credentials are at risk if they interact with malicious content targeting this vulnerability.

Conditions required to exploit

05Prerequisites

A site user must click a malicious link or visit an attacker-controlled page that triggers the vulnerability.

Key dates

06Disclosure timeline

August 27, 2026 CVE published

Related vulnerabilities

08Related CVE