Critical-Severity Flaw in IBM WebSphere Application Server - Liberty Tracked as CVE-2026-93909
A newly published critical vulnerability in IBM WebSphere Application Server - Liberty carries a CVSS score of 9.1. Here is what is affected and how to respond.
Key points
- CVE-2026-93909 affects IBM WebSphere Application Server - Liberty.
- CVSS 9.1 (Critical).
- No exploitation confirmed yet.
IBM WebSphere Application Server - Liberty is affected by CVE-2026-93909, a security flaw that the National Vulnerability Database rates 9.1 out of 10.
At a glance
- CVE
- CVE-2026-93909
- Product
- IBM WebSphere Application Server - Liberty
- CVSS
- 9.1 Critical
- Weakness
- CWE-384
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 is vulnerable by an authentication bypass vulnerability when samlWeb-2.0 feature is enabled.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Ibm | WebSphere Application Server - Liberty | up to 26.0.0.10 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-93909
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-93909?
CVE-2026-93909 is a CWE-384 vulnerability in IBM WebSphere Application Server - Liberty.
How severe is CVE-2026-93909?
It has a CVSS score of 9.1 Critical.
Is CVE-2026-93909 being exploited?
There is no public confirmation of exploitation at the time of publication.
