How severe is CVE-2026-9311?

CVE-2026-9311 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-9311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9311?

CVE-2026-9311 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-9311 have an EU (EUVD) identifier?

Yes. CVE-2026-9311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33735.

When was CVE-2026-9311 published?

CVE-2026-9311 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-9311

CVE-2026-9311 is a critical-severity vulnerability in Ibm Websphere Application Server with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33735
Weakness: CWE-94
Affected product: Ibm Websphere Application Server
Published: 2026-06-01
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-9311?: IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.
How severe is CVE-2026-9311?: CVE-2026-9311 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-9311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9311?: CVE-2026-9311 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-9311 have an EU (EUVD) identifier?: Yes. CVE-2026-9311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33735.
When was CVE-2026-9311 published?: CVE-2026-9311 was published on 2026-06-01 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7274733

Affected products (1)

cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:traditional:*:*:*

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