# CVE-2026-9311: IBM WebSphere Application Server remote code execution via security bypass

Source: https://junglewise.ai/threats/cve-2026-9311-ibm-websphere-application-server-remote-code-execution-via  
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-2026-9311 · 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 security flaw that allows remote attackers to execute unauthorized code. If exploited, an attacker could take full control of the server, potentially leading to data theft, service disruption, or further access into the corporate network. Organizations are advised to apply the available security patches immediately to protect their environments.

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-2026-9311 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9311 being exploited in the wild.

**How severe is CVE-2026-9311?** 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-2026-9311?** A patch was published on 2026-06-01: Interim fix PH71453 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-9311 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-9311?** 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 are vulnerable to remote code execution (RCE) due to a bypass of security controls. The vulnerability is classified as CWE-94 (Improper Control of Generation of Code), indicating a code injection flaw. An attacker can exploit this over the network without authentication, though the CVSS vector suggests high attack complexity. Successful exploitation allows for complete compromise of the confidentiality, integrity, and availability of the host system. IBM has released interim fix PH71453 to address this issue, with permanent fixes planned for 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 fix PH71453 released

## References

- [https://www.ibm.com/support/pages/node/7274733](https://www.ibm.com/support/pages/node/7274733)

## Related threats

- [IBM WebSphere Application Server insecure deserialization in messaging](https://junglewise.ai/threats/cve-2026-105442-ibm-websphere-application-server-8-5-and-9-0-and-ibm-websphere)
- [IBM WebSphere Application Server cryptographic signature verification bypass](https://junglewise.ai/threats/cve-2026-101294-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [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)