CVE-2024-33526 – A stored cross-site scripting (XSS) vulnerabili... (How to Fix)

Q: What is the severity of CVE-2024-33526?

CVE-2024-33526 has a CVSS score of 7.1 (HIGH). A stored cross-site scripting (XSS) vulnerability in ILIAS e-learning LMS allows authenticated administrators to inject malicious scripts via XML file uploads in user role import functionality. This affects ILIAS 7 versions before 7.30 and ILIAS 8 versions before 8.11. Attackers can execute arbitrary JavaScript in victims' browsers when they view the compromised content.

📋 TL;DR

A stored cross-site scripting (XSS) vulnerability in ILIAS e-learning LMS allows authenticated administrators to inject malicious scripts via XML file uploads in user role import functionality. This affects ILIAS 7 versions before 7.30 and ILIAS 8 versions before 8.11. Attackers can execute arbitrary JavaScript in victims' browsers when they view the compromised content.

💻 Affected Systems

Products:

ILIAS eLearning LMS

Versions: ILIAS 7.x before 7.30, ILIAS 8.x before 8.11

Operating Systems: All platforms running ILIAS

Default Config Vulnerable: ⚠️ Yes

Notes: Requires administrative privileges to exploit; regular users cannot trigger the vulnerability.

📦 What is this software?

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Administrator credentials could be stolen via session hijacking, leading to complete system compromise, data theft, or further privilege escalation within the ILIAS platform.

🟠

Likely Case

Attackers steal administrator session cookies to gain unauthorized access, modify course content, or access sensitive student/teacher data within the LMS.

🟢

If Mitigated

Limited to authenticated administrators only, with proper input validation preventing script execution and minimal impact on regular users.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires administrative access; the vulnerability is in XML parsing during user role imports.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: ILIAS 7.30, ILIAS 8.11, ILIAS 9.1

Vendor Advisory: https://docu.ilias.de/ilias.php?baseClass=illmpresentationgui&cmd=layout&ref_id=1719&obj_id=170029

Restart Required: No

Instructions:

1. Backup your ILIAS installation and database. 2. Download the patched version from the official ILIAS website. 3. Follow the ILIAS upgrade documentation for your version. 4. Verify the upgrade completed successfully.

🔧 Temporary Workarounds

Disable XML user role imports

all

Temporarily disable the vulnerable import feature until patching can be completed

Modify ILIAS configuration to remove import functionality or restrict access to administrators only

Implement input validation at web application firewall

all

Add WAF rules to block malicious XML content in uploads

Configure WAF to inspect XML uploads for script tags and malicious content

🧯 If You Can't Patch

Restrict administrative access to trusted IP addresses only
Implement strict content security policies (CSP) to mitigate XSS impact

🔍 How to Verify

Check if Vulnerable:

Check your ILIAS version via the administration interface or by examining the installation files

Check Version:

Check ILIAS version in administration panel or examine /ilias/ilias.php version information

Verify Fix Applied:

After upgrading, verify the version shows 7.30+, 8.11+, or 9.1+ and test the user role import functionality

📡 Detection & Monitoring

Log Indicators:

Unusual XML file uploads by administrators
Multiple failed import attempts
Administrative session anomalies

Network Indicators:

XML uploads containing script tags or JavaScript code
Unusual outbound connections after administrative actions

SIEM Query:

source="ilias_logs" AND (event="file_upload" AND file_type="xml") AND user_role="administrator"

📊 Metadata

CVE ID: CVE-2024-33526

CVSS v3 Score: 7.1 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CWE: CWE-79

Published: May 21, 2024

Last Updated: June 4, 2025

🔗 References

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