IBM WebSphere Application Server Liberty: security vulnerability (CVE-2026-11547)
Published Sources: BSI
What is affected, what to do
Ein Angreifer kann mehrere Schwachstellen in IBM WebSphere Application Server Liberty ausnutzen, um einen Denial of Service Angriff durchzuführen, um falsche Informationen darzustellen und um Informationen offenzulegen. IBM WebSphere Application Server Liberty ist ein leichter, dynamischer Anwendungsserver zur Entwicklung und Bereitstellung von Java-Anwendungen und Microservices.
Update IBM WebSphere Application Server Liberty to version 26.0.0.12, IBM WebSphere Application Server Liberty to version 26.0.0.11.
- Affected
- IBM WebSphere Application Server Liberty
< *..26.0.0.12 - IBM WebSphere Application Server Liberty
range_unparsed *..<26.0.0.11 DT505010 - IBM WebSphere Application Server Liberty
range_unparsed *..<26.0.0.11 DT505097 - IBM WebSphere Application Server Liberty
< *..26.0.0.11
- IBM WebSphere Application Server Liberty
- Fixed in
- IBM WebSphere Application Server Liberty
26.0.0.12 - IBM WebSphere Application Server Liberty
26.0.0.11
- IBM WebSphere Application Server Liberty
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Metrics
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Priority
No value is available for this vulnerability.
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CVSS v3
No value is available for this vulnerability.
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EPSS score
No value is available for this vulnerability.
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- Severity
- Reserved
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 91.46 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Ein Angreifer kann mehrere Schwachstellen in IBM WebSphere Application Server Liberty ausnutzen, um einen Denial of Service Angriff durchzuführen, um falsche Informationen darzustellen und um Informationen offenzulegen. IBM WebSphere Application Server Liberty ist ein leichter, dynamischer Anwendungsserver zur Entwicklung und Bereitstellung von Java-Anwendungen und Microservices.
Source: BSI CSAF, BSI WID Portal
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| IBM | WebSphere Application Server Liberty |
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Vendors and products
Included in the same advisory
| Not rated | CVE-2026-93879 | IBM WebSphere Application Server Liberty: Denial of Service | — | — |
| High | CVE-2026-91865 | Apache Neethi: Allocation of Resources Without Limits or Throttling | 7.5 | — |
| High | CVE-2026-91864 | Apache Neethi: Crafted WS-Policy documents bypass element/attribute limits causing memory exhaustion | 7.5 | — |
| High | CVE-2026-91863 | Apache Neethi: Uncontrolled Recursion | 7.5 | — |
| Not rated | CVE-2026-78636 | IBM WebSphere Application Server Liberty: security vulnerability | — | — |
| Not rated | CVE-2026-10844 | IBM WebSphere Application Server Liberty: security vulnerability | — | — |
| Not rated | CVE-2026-108284 | IBM WebSphere Application Server Liberty: security vulnerability | — | — |
| Not rated | CVE-2026-103320 | IBM WebSphere Application Server Liberty: security vulnerability | — | — |
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-11547"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-11547.svg?lang=en" alt="CVE-2026-11547 – NEOSEC Intel" height="20"></a>