Listen to this Post
CVE-2026-18499 is a privilege escalation vulnerability affecting IBM WebSphere Application Server Liberty versions 17.0.0.3 through 26.0.0.8. The vulnerability manifests when the server utilizes Liberty collectives, a feature designed for managing multiple Liberty servers as a single administrative domain. Specifically, the flaw resides in the improper authorization mechanisms within the `collectiveController-1.0` and `collectiveMember-1.0` features.
In a Liberty collective, a controller node manages multiple member nodes. An authenticated user with low privileges on a member node can exploit this vulnerability to escalate their privileges and gain unauthorized access to the controller. This occurs because the collective’s inter-node communication and authorization checks do not adequately validate the权限 of requests originating from member nodes. A malicious actor could send crafted requests to the collective controller, effectively bypassing standard authorization controls. The impact is significant: an attacker could achieve high confidentiality and integrity impacts, potentially reading sensitive data or modifying critical server configurations. IBM has assigned APAR DT497580 to track this issue and has made interim fixes available. A permanent fix is scheduled for inclusion in Liberty Fix Pack 26.0.0.9, targeted for release in the third quarter of 2026.
DailyCVE Form:
Platform: IBM WebSphere Liberty
Version: 17.0.0.3-26.0.0.8
Vulnerability: Privilege Escalation
Severity: High (8.1 CVSS)
date: 2026-08-12
Prediction: 2026-09-30 (Fix Pack 26.0.0.9)
What Undercode Say:
Analytics show active exploitation intelligence. CISA ADP reports `Exploitation: none` as of 2026-08-12. However, proof-of-concept code is anticipated. The SSVC (Stakeholder-Specific Vulnerability Categorization) analysis indicates Technical Impact: total. Immediate patching is strongly advised despite no public exploits. IBM’s official security bulletin (document 7283489) provides the primary mitigation guidance.
Exploit: (Educational Purposes!)
The vulnerability can be triggered by sending a specially crafted HTTP request from a compromised Liberty collective member to the collective controller. The following conceptual example demonstrates how an attacker might attempt to exploit the improper authorization.
Check if the collective feature is enabled:
grep -E "collectiveController-1.0|collectiveMember-1.0" server.xml
Craft a malicious request to escalate privileges (conceptual curl command):
curl -X POST https://<collective-controller-host>:9443/collectiveController/api/privilegedEndpoint \
-H "Content-Type: application/json" \
-d '{"action": "addAdminRole", "targetUser": "attacker"}'
Protection:
- Apply Interim Fix: Immediately apply the interim fix for APAR DT497580, available from IBM support.
- Upgrade: Plan to upgrade to Liberty Fix Pack 26.0.0.9 or later as soon as it is released.
- Disable Features: If not required, disable the `collectiveController-1.0` and `collectiveMember-1.0` features in
server.xml. - Network Segmentation: Restrict network access to collective controllers to only trusted member nodes.
Impact:
A successful exploit allows an attacker to gain elevated privileges on the Liberty collective controller. This can lead to full compromise of the collective, including the ability to read sensitive data (High Confidentiality impact) and modify server configurations (High Integrity impact). The attack vector is network-based, requires low privileges, and does not need user interaction. Organizations running affected versions in production environments face a significant risk of unauthorized administrative access and data breach.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
