# CVE-2026-15887: IBM WebSphere Application Server blind server-side request forgery in SOAP

Source: https://junglewise.ai/threats/cve-2026-15887-ibm-websphere-application-server-blind-server-side-request  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-15887 · Severity: medium · CVSS 5.4 · Published 2026-09-14

IBM WebSphere Application Server is a widely-used Java application server that runs business-critical enterprise applications. This vulnerability allows an authenticated attacker to make unauthorized network requests from the server to internal or external systems by exploiting improper handling of SOAP requests. An attacker could use this to access restricted internal services, exfiltrate data, or pivot to other systems on the corporate network.

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-2026-15887 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15887 being exploited in the wild.

**How severe is CVE-2026-15887?** Medium severity, with a CVSS score of 5.4, published 14 September 2026.

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

**Is there a fix for CVE-2026-15887?** 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-2026-15887 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-15887?** 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

The vulnerability is a blind server-side request forgery (SSRF) in IBM WebSphere Application Server versions 8.5 and 9.0 that arises from insufficient validation of SOAP request processing. The flaw allows an authenticated attacker (CWE-918) to craft malicious SOAP requests that cause the server to make arbitrary HTTP requests to internal or external targets without the attacker's direct network access. The attack requires valid credentials and network access to the WebSphere SOAP endpoint. Patches are available in versions 9.0.5.29 and later, and 8.5.5.31 and later.

## Affected products

- IBM WebSphere Application Server 8.5, 9.0

## Timeline

- 2026-09-14: disclosed

## References

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

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