Power System Improper Certificate Validation

Answer in brief

CVE-2026-16835 records a Unknown severity vulnerability in Power System Improper Certificate Validation. The current sources do not mark it as known exploited. The current feed maps IBM/Power Systems Firmware (generic), IBM/Server Firmware (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/Power Systems Firmware (generic), IBM/Server Firmware (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
IBM/Power Systems Firmwaregeneric	FW1120.00 \|\| FW1110.00 \|\| FW1060.00 \|\| FW950.00	Not reported
IBM/Server Firmwaregeneric	FW1120.00 \|\| FW1110.00 \|\| FW1060.00 \|\| FW950.00	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for IBM/Power Systems Firmware, IBM/Server Firmware.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Source referenceibm.com

Upstream source description

IBM Power Systems Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the FSP management network protocol. An unauthenticated attacker on the management network can bypass authentication and perform any administrative operation on the managed system, including control of partition power state, configuration, and console access across all hosted partitions, resulting in a confidentiality, integrity, and availability impact to the managed system.

Quoted source text, attributed separately from HOL analysis.