What is the CVSS score of CVE-2026-11711?

CVE-2026-11711 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.4%.

Is there a patch available for CVE-2026-11711?

Yes, a patch is available for CVE-2026-11711. Update the affected software to the latest version immediately.

WebSphere Application Server CVE-2026-11711

EUVD-2026-83288 MEDIUM

Deserialization of Untrusted Data (CWE-502)

2026-09-18 ibm

GHSA-qxf8-2p95-9hvv

Deserialization IBM Websphere Application Server

6.5

CVSS 3.1 · Vendor: ibm

Severity by source

Vendor (ibm) PRIMARY

6.5 MEDIUM

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

vuln.today AI

6.5 MEDIUM

Name Service reachable on the adjacent network (AV:A) without auth (PR:N); vendor-scoped to a deserialization-driven crash, so availability-only (A:H, C:N/I:N).

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

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

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Sep 18, 2026 - 20:04 vuln.today

CVE Published

Sep 18, 2026 - 19:08 cve.org

MEDIUM 6.5

DescriptionCVE.org

IBM WebSphere Application Server 9.0 and 8.5 is affected by a deserialization vulnerability in the Name Service component.

AnalysisAI

Adjacent-network attackers can drive the Name Service component of IBM WebSphere Application Server 8.5 and 9.0 into a denial-of-service condition by supplying maliciously crafted serialized data to the CORBA/IIOP naming endpoint, which the JVM then deserializes. The flaw is unauthenticated and requires no user interaction (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 6.5), so the practical barrier is network position rather than credentials: the attacker must be able to reach the Name Service on the same or an adjacent network segment, and default configurations leave that service listening on the network. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Requires adjacent-network (AV:A) reachability to the WebSphere Application Server Name Service - the CORBA/IIOP naming endpoint (typically the ORB bootstrap port) - on affected versions 8.5 or 9.0. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	This is a moderate-severity availability issue, not a critical RCE despite being a CWE-502 deserialization flaw. … 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	Apply the vendor fix documented in IBM's advisory at https://www.ibm.com/support/pages/node/7286610 - patch availability is confirmed for this issue, though the provided data does not specify an exact fix pack or interim fix number, so the precise maintenance level must be taken from that advisory rather than assumed. … Detailed patch versions, workarounds, and compensating controls in full report.