# CVE-2026-9319: IBM WebSphere Application Server remote code execution in JAX-WS

Source: https://junglewise.ai/threats/cve-2026-9319-ibm-websphere-application-server-remote-code-execution-in-jax-ws  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2026-9319 · Severity: critical · CVSS 9 · Published 2026-06-01

IBM WebSphere Application Server, a platform used to host and run enterprise Java applications, is vulnerable to a critical security flaw. An attacker could exploit this vulnerability to take full control of the server and execute unauthorized commands. This could lead to a total compromise of the application, including the theft of sensitive customer data or a complete shutdown of business operations.

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-2026-9319 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9319 being exploited in the wild.

**How severe is CVE-2026-9319?** Critical severity, with a CVSS score of 9, published 1 June 2026.

**Which products and versions are affected?** IBM WebSphere Application Server 9.0.0.0 - 9.0.5.28, 8.5.0.0 - 8.5.5.29.

**Is there a fix for CVE-2026-9319?** A patch was published on 2026-06-01: Interim fixes released; fix packs scheduled for Q3 2026 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-9319 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-9319?** 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

IBM WebSphere Application Server (versions 8.5 and 9.0) contains a deserialization of untrusted data vulnerability (CWE-502) within JAX-WS endpoints when WS-Security is enabled. The flaw allows a remote, unauthenticated attacker to send specially crafted input that, when processed, executes arbitrary code on the host system. While the attack vector is network-based and requires no user interaction, the complexity is rated as high, likely due to specific configuration requirements or the need for precise payload construction. IBM has released interim fixes (APAR PH71454) and plans to include permanent fixes in Fix Packs 9.0.5.29 and 8.5.5.30.

## Affected products

- IBM WebSphere Application Server 9.0.0.0 - 9.0.5.28, 8.5.0.0 - 8.5.5.29

## Timeline

- 2026-06-01: disclosed
- 2026-06-01: advisory
- 2026-06-01: patched: Interim fixes released; fix packs scheduled for Q3 2026

## References

- [https://www.ibm.com/support/pages/node/7274738](https://www.ibm.com/support/pages/node/7274738)

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