# CVE-2026-9320 — IBM WebSphere Application Server

> As of 2026-06-22, CVE-2026-9320 is a MEDIUM-severity vulnerability in IBM WebSphere Application Server, CVSS v3.1 5.9, EPSS 0.3% (22.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-9320 as of 2026-06-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-22

## What is CVE-2026-9320?

IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to a denial of service, caused by sending a specially-crafted request. A remote attacker could exploit this vulnerability to cause the server to consume memory resources.

The record classifies CVE-2026-9320 under weakness class [CWE-400](https://intel.threadlinqs.com/cwe/CWE-400). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 105 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.9 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 22.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-22

## Is CVE-2026-9320 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [IBM](https://intel.threadlinqs.com/vendors/ibm): WebSphere Application Server, WebSphere Application Server - Liberty

## How to fix CVE-2026-9320

No vendor patch reference has been recorded for CVE-2026-9320 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-9320

No threat campaign in the Threadlinqs corpus currently references CVE-2026-9320, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-23.

**Vendor advisory and patch**

- [ibm.com — vendor advisory](https://www.ibm.com/support/pages/node/7276579)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-9320
Full detection coverage and IOCs for threats exploiting CVE-2026-9320 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp