How severe is CVE-2026-18499?

CVE-2026-18499 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-18499 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-18499?

CVE-2026-18499 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-18499?

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.

When was CVE-2026-18499 published?

CVE-2026-18499 was published on 2026-08-12 and last updated on 2026-08-17.

CVE-2026-18499

CVE-2026-18499 is a high-severity vulnerability in Ibm Websphere Application Server with a CVSS 3.x base score of 8.1. 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-285.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Ibm Websphere Application Server
Published: 2026-08-12
Last modified: 2026-08-17

Description

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 is vulnerable to a privilege escalation when using Liberty collectives.

Frequently asked questions

What is CVE-2026-18499?: IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 is vulnerable to a privilege escalation when using Liberty collectives.
How severe is CVE-2026-18499?: CVE-2026-18499 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-18499 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-18499?: CVE-2026-18499 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-18499?: 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.
When was CVE-2026-18499 published?: CVE-2026-18499 was published on 2026-08-12 and last updated on 2026-08-17.

References

https://www.ibm.com/support/pages/node/7283489

Affected products (1)

cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*

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