CVE-2026-9311
IBM WebSphere Application Server versions 8.5 and 9.0 have a critical flaw that lets attackers run arbitrary code on the server without authentication. The vulnerability is caused by bypassing security controls, allowing remote attackers to take full control of the affected system.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
IBM WebSphere Application Server 8.5 and 9.0
Real-world impact
An attacker who exploits this flaw can execute any code on the server, potentially taking over the entire application environment, stealing data, or using the server to launch further attacks.
Why this severity
The CVSS score of 9 reflects a high impact (confidentiality, integrity, availability all high) combined with a low attack complexity and no user interaction required. The vector shows that the attack is remote, requires no privileges, and can compromise all aspects of the system.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 1, 2026 · Jun 1, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 22, 2026 · 13d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- ibm.com/support/pages/node/7274733vendor advisory