# CVE-2026-11711: IBM WebSphere Application Server deserialization vulnerability in Name Service

Source: https://junglewise.ai/threats/cve-2026-11711-ibm-websphere-application-server-9-0-and-8-5-is-affected-by-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-11711 · Severity: medium · CVSS 6.5 · Published 2026-09-18

IBM WebSphere Application Server is a middleware platform that runs enterprise Java applications for large organizations. A deserialization vulnerability in the Name Service component could allow an attacker to execute arbitrary code or cause denial of service on affected servers.

Technologies: [IBM WebSphere Application Server](https://junglewise.ai/threats/technologies/websphere-application-server). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-11711 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11711 being exploited in the wild.

**How severe is CVE-2026-11711?** Medium severity, with a CVSS score of 6.5, published 18 September 2026.

**Which products and versions are affected?** IBM WebSphere Application Server 9.0 and 8.5.

**Is there a fix for CVE-2026-11711?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-11711 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-11711?** Check whether you run IBM WebSphere Application Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A deserialization vulnerability exists in the Name Service component of IBM WebSphere Application Server versions 9.0 and 8.5. The vulnerability is accessible over the network without authentication, allowing unauthenticated remote attackers to trigger unsafe deserialization of untrusted data. Exploitation could lead to arbitrary code execution or information disclosure depending on gadget chains available in the runtime environment.

## Affected products

- IBM WebSphere Application Server 9.0 and 8.5

## Timeline

- 2026-09-18: disclosed

## References

- [https://www.ibm.com/support/pages/node/7286610](https://www.ibm.com/support/pages/node/7286610)

## Related threats

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- [IBM WebSphere Application Server authorization bypass in authentication](https://junglewise.ai/threats/cve-2026-95680-ibm-websphere-application-server-8-5-and-9-0-could-allow-an)
- [IBM WebSphere Application Server authentication bypass in CSIv2](https://junglewise.ai/threats/cve-2026-93907-ibm-websphere-application-server-8-5-and-9-0-could-allow-a-remote)
- [IBM WebSphere Application Server denial of service via resource consumption](https://junglewise.ai/threats/cve-2026-103499-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)