Is CVE-2026-105443 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-105443 being exploited in the wild.

How severe is CVE-2026-105443?

High severity, with a CVSS score of 8.2, published 13 October 2026.

Which products and versions are affected?

IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.10.

How is CVE-2026-105443 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-105443?

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.

CVE-2026-105443: IBM WebSphere Application Server Liberty improper access control

CVE-2026-105443 · Severity: high · CVSS 8.2 · Published 2026-10-13

IBM WebSphere Application Server Liberty is an enterprise Java application platform. When the restConnector feature is enabled, insufficient isolation between multiple server instances sharing the same installation can allow authenticated attackers to gain unauthorized access to other servers' data and configuration, potentially leading to data theft or system compromise.

Technologies: IBM WebSphere Application Server Liberty. Vendors: IBM.

Quick answers

Is CVE-2026-105443 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-105443 being exploited in the wild.
How severe is CVE-2026-105443?: High severity, with a CVSS score of 8.2, published 13 October 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-2026-105443?: Yes: fixed in WebSphere Application Server - Liberty 26.0.0.11 or later; interim fixes available for earlier versions (APAR DT503659). Until then: Verify whether restConnector-1.0 or restConnector-2.0 features are enabled on affected Liberty instances. If not required, disable these features to eliminate the attack surface. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-105443 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-105443?: 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 or later; interim fixes available for earlier versions (APAR DT503659)

Verify whether restConnector-1.0 or restConnector-2.0 features are enabled on affected Liberty instances. If not required, disable these features to eliminate the attack surface.

Technical details

The vulnerability is an improper access control flaw (CWE-284) affecting WebSphere Liberty versions 17.0.0.3 through 26.0.0.10 when restConnector-1.0 or restConnector-2.0 features are enabled. An attacker with local authentication credentials can exploit insufficient isolation between co-hosted servers to escalate privileges and access unauthorized resources. The attack requires network access and low privileges but affects the confidentiality and integrity of affected systems.

Affected products

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10

Timeline

2026-10-13: disclosed

References

https://www.ibm.com/support/pages/node/7292226

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