CVE-2026-77989
Received Received - Intake

Reflected Cross-Site Scripting in Joomla Events Manager Extension

Publication date: 2026-08-27

Last updated on: 2026-08-27

Assigner: Joomla! Project

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.

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Meta Information

Published
2026-08-27
Last Modified
2026-08-27
Generated
2026-08-27
AI Q&A
2026-08-27
EPSS Evaluated
N/A
NVD
CVE-2026-77989
EUVD
EUVD-2026-66862

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
joomlaeventmanager joomla_events_manager to 5.0.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

This is a reflected cross-site scripting (XSS) vulnerability in the Joomla Events Manager extension version before 5.0.1. It occurs when the PDF export link copies unescaped query strings from the current request into the PDF button URL, allowing attackers to inject malicious scripts that execute in users' browsers.

Detection Guidance

To detect this vulnerability, check if Joomla Events Manager version is below 5.0.1. Inspect network traffic for PDF export links containing unescaped query strings. Look for reflected XSS patterns in responses from the extension.

Impact Analysis

An attacker could trick a user into clicking a crafted link, leading to session hijacking, theft of sensitive data, or unauthorized actions on behalf of the user. It primarily affects users interacting with the vulnerable Joomla extension.

Compliance Impact

This XSS vulnerability could expose user data, potentially violating GDPR (data protection) and HIPAA (health data privacy) by enabling unauthorized access or data breaches. Compliance may be impacted if user data is compromised through exploitation.

Mitigation Strategies

Immediately update Joomla Events Manager to version 5.0.1 or later. If updating is not possible, disable the PDF export feature or restrict access to the vulnerable component until patched.

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