CVE-2026-5516

IBM WebSphere Application Server Liberty is affected by a security bypass vulnerability

Published May 27, 2026 CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed
Description
IBM WebSphere Application Server - Liberty 22.0.0.11 through 26.0.0.5 IBM WebSphere Application Server Liberty could allow a remote attacker to bypass security under limited conditions by exploiting a specific timing window.

Remediation

Vendor Solution

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH70798. To determine if a feature is enabled for IBM WebSphere Application Server Liberty, refer to How to determine if Liberty is using a specific feature https://www.ibm.com/support/pages/node/6553910 .  For IBM WebSphere Application Server Liberty 22.0.0.11 - 26.0.0.5 using the appSecurity-3.0, appSecurity-4.0 or appSecurity-5.0 feature(s):  · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH70798 https://www.ibm.com/support/pages/node/7273239 --OR-- · Apply Liberty Fix Pack 26.0.0.6 or later (targeted availability 3Q2026).  Additional interim fixes may be available and linked off the interim fix download page.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Ibm websphere Application Server
CPEs cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*
Vendors & Products Ibm websphere Application Server
Type Values Removed Values Added
Weaknesses CWE-362
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description IBM WebSphere Application Server - Liberty 22.0.0.11 through 26.0.0.5 IBM WebSphere Application Server Liberty could allow a remote attacker to bypass security under limited conditions by exploiting a specific timing window.
Title IBM WebSphere Application Server Liberty is affected by a security bypass vulnerability
First Time appeared Ibm
Ibm websphere Application Server Liberty
CPEs cpe:2.3:a:ibm:websphere_application_server___liberty:22.0.0.11:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server___liberty:26.0.0.5:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm websphere Application Server Liberty
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
ibm
Published
Updated
Jun 2, 2026, 4:13 PM
Reserved
Apr 3, 2026, 9:59 PM
Status
Modified
Published
May 27, 2026, 2:17 PM
Modified
Oct 26, 2026, 11:10 AM