CVE-2026-8400: IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition
IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-8400
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-84000.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-8400 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for IBM WebSphere Application
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-08-05
- medium[NEW] [medium] IBM WebSphere Application Server: Vulnerability allows bypassing security measurescert-bund · 2026-08-05
- medium[NEW] [medium] IBM WebSphere Application Server: Multiple vulnerabilities enable Denial of Servicecert-bund · 2026-07-31
- medium[NEW] [medium] IBM WebSphere Application Server Liberty: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-31
- high[UPDATE] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-07-31
- highCVE-2026-11536: IBM WebSphere Application Server 9.0, and 8.5 is affected by a remote code execution vulnerabi…nvd · 2026-07-30
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