CVE-2026-65881: Joomdle Information Disclosure Flaw

CVE-2026-65881 Overview

CVE-2026-65881 affects the Joomdle extension for Joomla, an integration bridge between Joomla CMS and Moodle learning platforms. Versions prior to 3.1.1 ship with an insecure default configuration that exposes CMS user account data. The default settings allow unauthenticated attackers to read user account details and initiate password resets against CMS accounts. The flaw is categorized as an Insecure Default Configuration issue and maps to [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor.

Critical Impact
Unauthenticated remote attackers can read Joomla CMS account data and trigger password resets, enabling account takeover of affected sites running Joomdle before version 3.1.1.

Affected Products

Joomdle extension for Joomla versions prior to 3.1.1
Joomla CMS installations integrating Moodle via Joomdle
Sites using default Joomdle configuration settings

Discovery Timeline

2026-07-28 - CVE-2026-65881 published to NVD
2026-07-28 - Last updated in NVD database

Technical Details for CVE-2026-65881

Vulnerability Analysis

Joomdle is a third-party Joomla extension that bridges the Joomla CMS with the Moodle learning management system. The vulnerability originates from the shipped default configuration of the extension. Out of the box, the extension exposes endpoints that permit reading of user account information and triggering password reset operations without adequate authentication controls.

An unauthenticated attacker reachable over the network can query the exposed interface to enumerate CMS user accounts. The same interface allows the attacker to invoke password reset functionality against any target account. Successful exploitation compromises confidentiality of user records and provides a path to full account takeover through the reset workflow.

The CVSS vector reflects a network-reachable, unauthenticated, low-complexity attack with a high impact on confidentiality. Integrity and availability are not directly affected by the disclosure primitive itself, though downstream account takeover clearly impacts both.

Root Cause

The root cause is an insecure default configuration in Joomdle versions before 3.1.1. The extension enables privileged account-access operations by default without requiring administrator-configured authentication. Any operator installing Joomdle with default settings inherits an exposed attack surface unless they manually harden the configuration.

Attack Vector

Exploitation requires only network access to the Joomla site running a vulnerable Joomdle version. No credentials, user interaction, or prior foothold are required. An attacker sends crafted requests to the Joomdle-exposed endpoints to read account records or invoke a password reset against a chosen CMS user. Refer to the Joomdle Website Overview for product context. No verified public exploit code is currently documented for this CVE.

Detection Methods for CVE-2026-65881

Indicators of Compromise

Unexpected password reset emails delivered to CMS users, particularly administrators
Unauthenticated HTTP requests to Joomdle-related endpoints from external IP addresses
Web server logs showing repeated queries to Joomdle service URLs enumerating account identifiers
Successful logins immediately following a password reset event initiated from an unfamiliar source

Detection Strategies

Inventory Joomla installations and identify sites running the Joomdle extension below version 3.1.1
Review Joomdle configuration to confirm whether default account-access settings remain enabled
Correlate password reset events with source IP reputation and geolocation to surface anomalous resets
Alert on high-frequency access to Joomdle service endpoints from single sources

Monitoring Recommendations

Enable verbose access logging on web servers hosting Joomla with the Joomdle extension
Forward Joomla application logs and web access logs to a central SIEM for correlation
Monitor CMS user table for unexpected email address or password hash changes
Track outbound password reset email volume as a leading indicator of enumeration abuse

How to Mitigate CVE-2026-65881

Immediate Actions Required

Upgrade the Joomdle extension to version 3.1.1 or later on all Joomla sites
Audit CMS user accounts for unauthorized password changes or email address modifications since installation
Force password rotation for administrative and high-privilege Joomla accounts
Restrict network access to Joomdle service endpoints where feasible while patching is completed

Patch Information

Upgrade Joomdle to version 3.1.1 or newer to remediate the insecure default configuration. Consult the Joomdle project site for release artifacts and installation guidance. After upgrading, review the extension configuration to confirm that account-access features require authentication and are limited to trusted origins.

Workarounds

Disable the Joomdle extension until an upgrade to 3.1.1 or later can be applied
Place the Joomla site behind a web application firewall rule blocking unauthenticated access to Joomdle service endpoints
Restrict Joomdle endpoint access at the web server level using IP allowlisting for known Moodle integration hosts
Enable multi-factor authentication for Joomla administrator accounts to blunt takeover following password reset abuse

bash

# Example Apache configuration restricting Joomdle service endpoints to a trusted Moodle host
<Location "/components/com_joomdle">
    Require ip 10.0.0.0/24
</Location>