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CVE-2026-101117: IBM WebSphere Extreme Scale Security Vulnerability

CVE-2026-101117 explained: critical Security Vulnerability in IBM WebSphere Extreme Scale. CVSS 9.1. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 8, 2026

CVSS
9.1 CRITICAL
EPSS
n/a
CISA KEV
Not listed
CWE
CWE-16

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-101117 Overview

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.2.2 could allow a remote attacker to bypass security restrictions due to improper Content Security Policy configuration.

Critical Impact

Remote, unauthenticated attackers can exploit this Security Vulnerability in IBM WebSphere Extreme Scale. The CVSS base score is 9.1 (Critical).

Affected Products

  • IBM WebSphere Extreme Scale: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-08: CVE-2026-101117 published to the National Vulnerability Database by psirt@us.ibm.com
  • 2026-11-08: last updated in the NVD database

Technical Details for CVE-2026-101117

Vulnerability Analysis

CVE-2026-101117 is a Security Vulnerability weakness (CWE-16) in IBM WebSphere Extreme Scale. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction.

With a CVSS base score of 9.1, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The vendor description states: IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.2.2 could allow a remote attacker to bypass security restrictions due to improper Content Security Policy configuration.

Attack Vector

Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is low complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Detection Methods for CVE-2026-101117

Detection Strategies

  • Inventory every instance of IBM WebSphere Extreme Scale and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward IBM WebSphere Extreme Scale application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-101117

Immediate Actions Required

  • Apply the fixed version of IBM WebSphere Extreme Scale named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for IBM WebSphere Extreme Scale.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-101117 is a critical severity Security Vulnerability in IBM WebSphere Extreme Scale with a CVSS score of 9.1. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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