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IBM WebSphere Application Server EUVDEUVD-2026-40396

| CVE-2026-11712 CRITICAL
Cross-site Scripting (XSS) (CWE-79)
2026-06-30 psirt@us.ibm.com GHSA-r8wf-c575-w3gq
XSS IBM Websphere Application Server
9.3
CVSS 3.1 · Vendor: us
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Severity by source

Vendor (us) PRIMARY
9.3 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
vuln.today AI
6.1 MEDIUM

Network-reachable reflected XSS needs no attacker auth (PR:N) but requires admin interaction (UI:R); script in another security context yields S:C with limited C:L/I:L, not the High impacts IBM assigned.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (us).

CVSS VectorVendor: us

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

1
Analysis Generated
Jun 30, 2026 - 20:35 vuln.today

DescriptionCVE.org

IBM WebSphere Application Server 9.0, and 8.5 is affected by a cross-site scripting vulnerability in the administrative console help system.

AnalysisAI

Cross-site scripting in IBM WebSphere Application Server 9.0 and 8.5 lets a remote attacker inject malicious script into the administrative console help system, which executes in the browser session of an administrator who is lured into viewing the crafted content. Because the payload runs inside an authenticated admin context, it can be abused to hijack the console session, manipulate configuration, or steal sensitive credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious script payload for console help system
Delivery
Deliver crafted link to WebSphere administrator
Exploit
Administrator opens content in authenticated console
Execution
Script executes in admin session context
Impact
Hijack session / alter configuration
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Vulnerability AssessmentAI

Exploitation Exploitation targets the administrative console help system of WebSphere Application Server 9.0 / 8.5 and requires a victim administrator to interact with attacker-supplied content (CVSS UI:R) - typically opening a crafted link or viewing injected help content while authenticated to the console. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict and warrant scrutiny. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a URL or content fragment containing a malicious script payload targeting the WebSphere administrative console help system and sends it to a WebSphere administrator (e.g., via phishing). When the authenticated administrator opens it in the console, the script executes in their session and can exfiltrate session tokens or issue console actions on their behalf. …
Remediation Apply the remediation described in IBM's security bulletin at https://www.ibm.com/support/pages/node/7278590, which is the authoritative source for the corrective fix pack or interim fix for WebSphere Application Server 9.0 and 8.5 - Patch available per vendor advisory; an exact fixed version string was not provided in the input data and should be taken directly from that bulletin rather than assumed. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Segment administrative console access to authenticated internal networks only; apply firewall rules restricting access to known administrator IP ranges. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-40396 vulnerability details – vuln.today
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