How severe is CVE-2026-9330?

CVE-2026-9330 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-9330 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9330?

CVE-2026-9330 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9330?

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

Does CVE-2026-9330 have an EU (EUVD) identifier?

Yes. CVE-2026-9330 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33740.

When was CVE-2026-9330 published?

CVE-2026-9330 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-9330

CVE-2026-9330 is a high-severity vulnerability in Ibm Websphere Application Server with a CVSS 3.x base score of 8.5. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.5)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33740
Weakness: CWE-502
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 affected by an improper validation of user-supplied data during deserialization using the SAML Web Single Sign-On component. This could result in remote code execution via a crafted HTTP request when combined with a suitable gadget chain.

Frequently asked questions

What is CVE-2026-9330?: IBM WebSphere Application Server 9.0, and 8.5 is affected by an improper validation of user-supplied data during deserialization using the SAML Web Single Sign-On component. This could result in remote code execution via a crafted HTTP request when combined with a suitable gadget chain.
How severe is CVE-2026-9330?: CVE-2026-9330 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-9330 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9330?: CVE-2026-9330 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9330?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-9330 have an EU (EUVD) identifier?: Yes. CVE-2026-9330 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33740.
When was CVE-2026-9330 published?: CVE-2026-9330 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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