CVE-2026-12943
Unauthenticated arbitrary command execution with elevated privileges in IBM HMC management systems.
Is CVE-2026-12943 being exploited?
Not confirmed. CVE-2026-12943 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 1.0% probability of exploitation in the next 30 days.
How severe is CVE-2026-12943?
CVE-2026-12943 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-2026-12943?
Yes. A fix has been recorded for CVE-2026-12943. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12943 affect?
CVE-2026-12943 affects IBM HMC v10.3.1050.0 - 10.3.1064.0, IBM HMC v11.1.1110.0 - 11.1.1112.0, Novalink / IBM HMC management systems for IBM Power. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12943?
Isolate HMC, restrict access to management network, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can run arbitrary commands as elevated/root on HMC, compromise management console and all managed IBM Power systems.
Immediate action required
- affected>= 10.3.1050.0 and <= 10.3.1064.0
- affected>= 11.1.1110.0 and <= 11.1.1112.0
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.