Quick answers
- Is CVE-2026-11537 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11537 being exploited in the wild.
- How severe is CVE-2026-11537?
- Medium severity, with a CVSS score of 4.3, published 18 September 2026.
- Which products and versions are affected?
- IBM WebSphere Application Server 8.5 before 8.5.5.31, 9.0 before 9.0.5.29.
- Is there a fix for CVE-2026-11537?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-11537 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-11537?
- 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.
Technical details
The vulnerability exists in the FileTransfer servlet of IBM WebSphere Application Server versions 8.5 and 9.0 prior to the patched versions (8.5.5.31 and 9.0.5.29). A remote attacker can leverage improper access controls or input validation in this servlet to read files from the server's file system. The attack requires network access to the vulnerable servlet and no authentication is specified as required.
Affected products
- IBM WebSphere Application Server 8.5 before 8.5.5.31, 9.0 before 9.0.5.29
Timeline
- 2026-09-18: disclosed