# CVE-2026-93907: IBM WebSphere Application Server authentication bypass in CSIv2

Source: https://junglewise.ai/threats/cve-2026-93907-ibm-websphere-application-server-8-5-and-9-0-could-allow-a-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-93907 · Severity: high · CVSS 8.1 · Published 2026-10-13

IBM WebSphere Application Server is an enterprise application server used to host Java-based business applications. A flaw in its CSIv2 (Common Secure Interoperability protocol version 2) authentication handler allows remote attackers to bypass authentication without valid credentials, potentially gaining unauthorized access to protected applications and data.

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-2026-93907 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93907 being exploited in the wild.

**How severe is CVE-2026-93907?** High severity, with a CVSS score of 8.1, published 13 October 2026.

**Which products and versions are affected?** IBM WebSphere Application Server 8.5.0.0 through 8.5.5.31, 9.0.0.0 through 9.0.5.29.

**Is there a fix for CVE-2026-93907?** Yes: fixed in WebSphere Application Server 9.0.5.30, 8.5.5.32 (targeted availability 4Q2026). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-93907 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-93907?** 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.

## How to fix

- Fixed in WebSphere Application Server 9.0.5.30, 8.5.5.32 (targeted availability 4Q2026)

## Technical details

The vulnerability is an improper authentication flaw (CWE-287) in the CSIv2 inbound propagation handler that permits remote attackers to bypass authentication checks. The attack requires network access and elevated complexity conditions but no authentication or user interaction. A successful exploit grants the attacker full unauthorized access to the application server.

## Affected products

- IBM WebSphere Application Server 8.5.0.0 through 8.5.5.31, 9.0.0.0 through 9.0.5.29

## Timeline

- 2026-10-13: disclosed

## References

- [https://www.ibm.com/support/pages/node/7292216](https://www.ibm.com/support/pages/node/7292216)

## 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 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)
- [IBM WebSphere Application Server HTTP request smuggling](https://junglewise.ai/threats/cve-2026-11722-ibm-websphere-application-server-and-websphere-application-server)