CVE-2024-33528 – A stored cross-site scripting (XSS) vulnerabili... (How to Fix)

Q: What is the severity of CVE-2024-33528?

CVE-2024-33528 has a CVSS score of 4.7 (MEDIUM). A stored cross-site scripting (XSS) vulnerability in ILIAS eLearning LMS allows authenticated users with tutor privileges to inject malicious scripts via XML file upload. This can lead to session hijacking, data theft, or phishing attacks against other users. The vulnerability affects ILIAS versions 7 before 7.30 and 8 before 8.11.

📋 TL;DR

A stored cross-site scripting (XSS) vulnerability in ILIAS eLearning LMS allows authenticated users with tutor privileges to inject malicious scripts via XML file upload. This can lead to session hijacking, data theft, or phishing attacks against other users. The vulnerability affects ILIAS versions 7 before 7.30 and 8 before 8.11.

💻 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 (typically Linux/Windows with PHP)

Default Config Vulnerable: ⚠️ Yes

Notes: Requires authenticated user with tutor privileges; XML file upload functionality must be accessible.

📦 What is this software?

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could steal administrator credentials, compromise user accounts, deface the platform, or use the XSS as a stepping stone for further attacks like PHP code execution (as referenced in security advisories).

🟠

Likely Case

Tutors could inject malicious scripts that execute in other users' browsers, potentially stealing session cookies, redirecting to phishing sites, or performing actions on behalf of victims.

🟢

If Mitigated

With proper input validation and output encoding, malicious scripts would be neutralized, preventing execution in user browsers.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires tutor-level access; public security advisories demonstrate the vulnerability and potential escalation to code execution.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: ILIAS 7.30, ILIAS 8.11, or later

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 (7.30+ or 8.11+) from the official ILIAS website. 3. Follow the ILIAS update instructions to apply the patch. 4. Verify the update completed successfully.

🔧 Temporary Workarounds

Restrict XML file uploads

all

Temporarily disable XML file upload functionality for tutor roles via ILIAS permissions or web server configuration.

Implement WAF rules

all

Deploy web application firewall rules to block malicious script patterns in XML uploads.

🧯 If You Can't Patch

Implement strict input validation and output encoding for XML upload processing.
Limit tutor privileges to trusted users only and monitor their activities.

🔍 How to Verify

Check if Vulnerable:

Check ILIAS version via admin interface or by examining the installation files; versions 7.0-7.29 or 8.0-8.10 are vulnerable.

Check Version:

Check the ILIAS admin panel or view the 'ilias.ini.php' configuration file for version details.

Verify Fix Applied:

Confirm the ILIAS version is 7.30 or higher, or 8.11 or higher, and test XML upload functionality with script payloads to ensure they are sanitized.

📡 Detection & Monitoring

Log Indicators:

Unusual XML file uploads by tutor accounts
HTTP requests containing script tags or JavaScript in upload parameters

Network Indicators:

XML upload requests with embedded script content
Subsequent requests triggering the injected scripts

SIEM Query:

source="web_logs" AND (uri_path="/ilias/*upload*" AND (body CONTAINS "<script>" OR body CONTAINS "javascript:"))

📊 Metadata

CVE ID: CVE-2024-33528

CVSS v3 Score: 4.7 (MEDIUM)

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

CWE: CWE-79

Published: May 21, 2024

Last Updated: June 4, 2025

🔗 References

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