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