CVE-2026-93907 PUBLISHED

IBM WebSphere Application Server is affected by a bypass authentication vulnerability

Assigner: ibm
Reserved: 18.09.2026 Published: 13.10.2026 Updated: 13.10.2026

IBM WebSphere Application Server 8.5, and 9.0 could allow a remote attacker to bypass authentication by exploiting a flaw in the CSIv2 inbound propagation handler.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.1

Product Status

Vendor IBM
Product WebSphere Application Server
Versions
  • Version 8.5 is affected
  • Version 9.0 is affected

Solutions

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR DT502673.

For IBM WebSphere Application Server traditional:

For V9.0.0.0 through 9.0.5.29: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves DT502673 https://www.ibm.com/support/pages/node/7292211 https://www.ibm.com/support/pages/node/7292211 --OR-- · Apply Fix Pack 9.0.5.30 or later (targeted availability 4Q2026). 

For V8.5.0.0 through 8.5.5.31: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves DT502673 https://www.ibm.com/support/pages/node/7292211 https://www.ibm.com/support/pages/node/7292211 --OR-- · Apply Fix Pack 8.5.5.32 or later (targeted availability 4Q2026). 

Additional interim fixes may be available and linked off the interim fix download page.

References

Problem Types

  • CWE-287 Improper Authentication CWE