# CVE-2026-78636: IBM WebSphere Application Server Liberty information disclosure in JMX REST connector

Source: https://junglewise.ai/threats/cve-2026-78636-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-08. Updated: 2026-11-08  
License: CC BY 4.0 with a link back

CVE-2026-78636 · Severity: medium · CVSS 4.3 · Published 2026-11-08

IBM WebSphere Application Server Liberty is an enterprise Java application platform used to run business-critical applications. The vulnerability allows authenticated attackers to access sensitive information by exploiting unsafe class reflection in the JMX REST connector. This could lead to exposure of confidential data such as configuration details, credentials, or business information.

Technologies: [IBM WebSphere Application Server Liberty](https://junglewise.ai/threats/technologies/websphere-application-server-liberty). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-78636 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78636 being exploited in the wild.

**How severe is CVE-2026-78636?** Medium severity, with a CVSS score of 4.3, published 8 November 2026.

**Which products and versions are affected?** IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.10.

**Is there a fix for CVE-2026-78636?** Yes: fixed in WebSphere Application Server Liberty 26.0.0.11. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-78636 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-78636?** Check whether you run IBM WebSphere Application Server Liberty 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 Liberty 26.0.0.11

## Technical details

An information disclosure vulnerability exists due to unsafe class reflection in the JMX REST connector body parser (CWE-470). The vulnerability requires authentication and network access, allowing an authenticated attacker to select and instantiate arbitrary classes to extract sensitive information. A fix is available in version 26.0.0.11.

## Affected products

- IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.10

## Timeline

- 2026-11-08: disclosed

## References

- [https://www.ibm.com/support/pages/node/7295268](https://www.ibm.com/support/pages/node/7295268)

## Related threats

- [IBM WebSphere Application Server Liberty server-side request forgery in Admin Center](https://junglewise.ai/threats/cve-2026-11547-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [IBM WebSphere Application Server Liberty open redirect](https://junglewise.ai/threats/cve-2026-10844-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [IBM WebSphere Application Server Liberty information disclosure](https://junglewise.ai/threats/cve-2026-108284-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [IBM WebSphere Application Server Liberty information disclosure](https://junglewise.ai/threats/cve-2026-103320-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [IBM WebSphere Application Server Liberty denial of service via uncaught exception](https://junglewise.ai/threats/cve-2026-95696-ibm-websphere-application-server-liberty-20-0-0-12-through-26-0-0)