# CVE-2026-8644: IBM WebSphere Application Server identity spoofing authentication bypass

Source: https://junglewise.ai/threats/cve-2026-8644-ibm-websphere-application-server-identity-spoofing-authentication  
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-2026-8644 · Severity: critical · CVSS 9.1 · Published 2026-06-01

IBM WebSphere Application Server, a platform used to host and run enterprise Java applications, is vulnerable to an identity spoofing flaw. This vulnerability allows an unauthenticated attacker to impersonate legitimate users or systems over the network. Successful exploitation could lead to unauthorized data modification or a significant disruption of business operations and services.

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-2026-8644 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8644 being exploited in the wild.

**How severe is CVE-2026-8644?** Critical severity, with a CVSS score of 9.1, 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-2026-8644?** A patch was published on 2026-06-01: Interim fix PH71422 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-8644 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-8644?** 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 is vulnerable to an authentication bypass via identity spoofing (CWE-290). The vulnerability exists in versions 9.0 (up to 9.0.5.28) and 8.5 (up to 8.5.5.29). An unauthenticated remote attacker can exploit this flaw over the network with low complexity and no user interaction required. Successful exploitation allows the attacker to spoof identities, potentially leading to high impacts on system integrity and availability. IBM has released interim fixes under APAR PH71422 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 fix PH71422 released

## References

- [https://www.ibm.com/support/pages/node/7274740](https://www.ibm.com/support/pages/node/7274740)

## Related threats

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- [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)