Affects widely used enterprise middleware (IBM WebSphere); RCE can lead to full server compromise across many organizations.
CVE-2026-11536
RCE in IBM WebSphere SOAP/JMX connector (WAS 9.0 & 8.5).
Is CVE-2026-11536 being exploited?
Not confirmed. CVE-2026-11536 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-11536?
CVE-2026-11536 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-11536?
Yes. A fix has been recorded for CVE-2026-11536. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-11536 affect?
CVE-2026-11536 affects IBM WebSphere Application Server 9.0, IBM WebSphere Application Server 8.5. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-11536?
Apply vendor patch or disable/restrict SOAP/JMX; restrict network access to management interfaces.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via SOAP/JMX connector allowing attackers to run arbitrary code as the WebSphere process, enabling server compromise and data/control loss.
Immediate action required
- affected9.0
- affected8.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.