CVE-2026-9311 | IBM WebSphere Application Server is affected by remote code execution

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

Published: 2026-06-01 Last update: 2026-06-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-9311 is rated Moderate Risk (53.4/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.26%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-9311

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-02 — 0.26% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-9311

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 6.0 [email protected]

Weakness enumeration for CVE-2026-9311

GitHub Security Advisory for CVE-2026-9311

GHSA-gfh5-5q87-hr66 · Severity: critical — IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by...

Affected software / configurations for CVE-2026-9311

Vendor Product Version Raw CPE
ibm websphere_application_server >= 8.5.0.0, < 8.5.5.30 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:traditional:*:*:*
ibm websphere_application_server >= 9.0.0.0, < 9.0.5.29 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:traditional:*:*:*

References for CVE-2026-9311

cvelogic Threat Intelligence