Widely deployed IBM WebSphere Server components; RCE via plug-ins could enable broad enterprise compromise.
CVE-2026-8633
RCE in IBM WebSphere Web Server Plug-ins via crafted requests.
Is CVE-2026-8633 being exploited?
Not confirmed. CVE-2026-8633 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 0.85% probability of exploitation in the next 30 days.
How severe is CVE-2026-8633?
CVE-2026-8633 is rated Critical with a CVSS score of 9.8. 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-2026-8633?
Yes. A fix has been recorded for CVE-2026-8633. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-8633 affect?
CVE-2026-8633 affects IBM WebSphere Application Server Plug-ins, IBM WebSphere Liberty, WebSphere Application Server, WebSphere Liberty. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-8633?
Patch when available; monitor for exploit attempts
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on IBM WebSphere via Web Server Plug-ins; attacker could run arbitrary code and take over the server.
Immediate action required
- affected8.5, 9.0
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.