Affects IBM Power Systems FSP firmware used in enterprise servers; unauthenticated full admin access can disrupt operations and data across organizations.
CVE-2026-16835
Auth bypass in IBM Power Systems FSP management allows full admin access.
Is CVE-2026-16835 being exploited?
Not confirmed. CVE-2026-16835 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 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-16835?
CVE-2026-16835 is rated Critical. 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-2026-16835?
Yes. A fix has been recorded for CVE-2026-16835. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16835 affect?
CVE-2026-16835 affects IBM Power Systems FSP FW1120.00, FW1110.00–FW1110.30, FW1060.00–FW1060.80, FW950.00–FW950.H2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16835?
Isolate management network, restrict FSP access, monitor interfaces, apply vendor firmware updates when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker on management network can bypass authentication to perform full admin actions: power control, config changes, and console access across all partitions.
Immediate action required
- affectedFW1120.00
- affected>= FW1110.00 and <= FW1110.30
- affected>= FW1060.00 and <= FW1060.80
- affected>= FW950.00 and <= FW950.H2
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.