# CVE-2026-77816: IBM WebSphere Application Server Liberty improper certificate validation

Source: https://junglewise.ai/threats/cve-2026-77816-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0  
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-2026-77816 · Severity: medium · CVSS 6.5 · Published 2026-10-13

IBM WebSphere Application Server Liberty is an enterprise Java application platform used to deploy and run business-critical applications. The administrative client fails to properly validate SSL/TLS certificates, allowing attackers to intercept connections and obtain sensitive information such as credentials or configuration data. Organizations running affected versions should apply the latest security updates immediately.

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-2026-77816 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77816 being exploited in the wild.

**How severe is CVE-2026-77816?** Medium severity, with a CVSS score of 6.5, published 13 October 2026.

**Which products and versions are affected?** IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.9.

**Is there a fix for CVE-2026-77816?** Yes: fixed in 26.0.0.10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-77816 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77816?** 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 26.0.0.10

## Technical details

A man-in-the-middle vulnerability in the administrative client caused by improper certificate validation (CWE-295). An unauthenticated attacker on the network can exploit this with high complexity to obtain sensitive information and make limited integrity changes. The vulnerability affects the administrative client component when connecting over untrusted networks, and a fix is available in version 26.0.0.10.

## Affected products

- IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.9

## Timeline

- 2026-10-13: disclosed

## References

- [https://www.ibm.com/support/pages/node/7291394](https://www.ibm.com/support/pages/node/7291394)

## Related threats

- [IBM WebSphere Application Server Liberty information disclosure in JMX REST connector](https://junglewise.ai/threats/cve-2026-78636-ibm-websphere-application-server-liberty-17-0-0-3-through-26-0-0)
- [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)