What is the CVSS score of CVE-2026-11539?

CVE-2026-11539 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.3%.

Is there a patch available for CVE-2026-11539?

Yes, a patch is available for CVE-2026-11539. Update the affected software to the latest version immediately.

WebSphere Application Server CVE-2026-11539

EUVD-2026-83278 MEDIUM

Missing Authentication for Critical Function (CWE-306)

2026-09-18 ibm

GHSA-r353-h774-697m

Authentication Bypass IBM Websphere Application Server

5.3

CVSS 3.1 · Vendor: ibm

Severity by source

Vendor (ibm) PRIMARY

5.3 MEDIUM

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

vuln.today AI

5.3 MEDIUM

Remote unauthenticated low-complexity auth bypass (CWE-306) on a network connector; impact accepted as vendor-scoped limited disclosure, so C:L with I:N/A:N.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Sep 18, 2026 - 20:06 vuln.today

DescriptionCVE.org

IBM WebSphere Application Server 9.0 and 8.5 is affected by an authentication bypass vulnerability in the SOAP/JMX connector.

AnalysisAI

Unauthenticated network access to the SOAP/JMX administrative connector on IBM WebSphere Application Server 8.5 and 9.0 can bypass authentication, allowing an attacker to read limited information from the server (CWE-306, CVSS 5.3). The flaw is remotely reachable without credentials or user interaction (PR:N/UI:N/AC:L), but impact is confined to low confidentiality loss - no code execution, configuration change, or denial of service. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Requires network access to the WebSphere Application Server administrative SOAP/JMX connector endpoint on a vulnerable 9.0 or 8.5 instance; no authentication, credentials, or user interaction are needed (PR:N/UI:N/AC:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	This is a genuine but limited-impact issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	Patch available per vendor advisory: IBM publishes the fix for WebSphere Application Server 8.5 and 9.0 at https://www.ibm.com/support/pages/node/7286610 - apply the interim fix or fix-pack level listed there for your exact maintenance level, as the input data does not specify a single version number applicable to all installations. … Detailed patch versions, workarounds, and compensating controls in full report.