What is CVE-2026-11537?

CVE-2026-11537 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Trusting HTTP Permission Methods on the Server Side. CVSS score: 4.3/10. Published 2026-09-18.

How severe is CVE-2026-11537?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in IBM Websphere Application Server

CVE-2026-11537

IBM WebSphere Application Server 9.0, and 8.5 could allow a remote attacker to obtain sensitive information about the file system through the FileTransfer servlet.

Published 2026-09-18 · last modified 2026-09-19.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.6th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

IBM Websphere Application Server — versions 8.5, 9.0

Weakness classification (CWE)

CWE-650 — Trusting HTTP Permission Methods on the Server Side

References

www.ibm.com/support/pages/node/7286610 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-11537?: CVE-2026-11537 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Trusting HTTP Permission Methods on the Server Side. CVSS score: 4.3/10. Published 2026-09-18.
How severe is CVE-2026-11537?: Medium severity. CVSS v3 base score is 4.3 out of 10.