What is a fractional CISO (vCISO)?
A fractional CISO, also called a vCISO, is an experienced security executive who leads your security program part-time, on a defined scope, instead of as a full-time hire. You get the judgment and accountability of a chief information security officer without the cost of one. Here is what the role actually does, when you need it, and how it compares to the alternatives.
What a fractional CISO actually does
The title matters less than the job. A fractional CISO owns your security program the way a full-time one would. That means setting the strategy and the roadmap, running the policy lifecycle, and making the risk decisions: what to fix, what to accept, and what compensating controls are good enough. It means being the liaison when auditors and assessors show up, and translating security into something your board and executives can act on.
Day to day, that looks like vendor security reviews, access and control oversight, incident escalation, and the executive and board reporting that keeps leadership informed and out of surprises. The distinction that matters: a fractional CISO is accountable leadership, not a task-doer. They decide and own, rather than just execute a checklist someone else wrote.
When you need one
Most companies do not wake up wanting a CISO. They hit a moment. The signals are consistent:
Customers or auditors start asking hard questions about your security, and no one internally can answer with authority. Your board asks about cyber risk and you do not have a defensible answer. You have an IT team that keeps the lights on, but no one who owns security as a discipline. You are pre-IPO or scaling fast and the stakes have quietly gotten higher. You had a breach or a near miss. Or a deal stalled because an enterprise buyer's security review flagged gaps you had not addressed.
In every one of these, the need is the same: you need senior security judgment and someone accountable for it, but you do not need, or cannot yet justify, a full-time executive salary. That gap is exactly what the fractional model fills.
Fractional CISO vs. the alternatives
A full-time CISO is the right answer eventually, at the scale and risk level where the role needs to be in the building every day. For most growing companies, that day has not arrived, and hiring early means paying a premium for capacity you will not fully use.
A bundled "vCISO" from an MSSP or MSP often turns out to be tools and alerts with a light-touch advisor attached. You get monitoring and a dashboard, but not strategic ownership, and often rotating junior staff and cookie-cutter deliverables. If what you needed was a roadmap and someone to own it, that is not the same thing.
A compliance or GRC platform is a system of record, not a system of judgment. It collects evidence and watches for drift, which is genuinely useful, but it cannot decide what is acceptable, run the manual controls, or be the accountable name when it counts. We wrote about that trade-off in detail in people vs. platform.
How engagements are structured
Good fractional engagements are scoped, not open-ended. Typically they are tiered by how involved the CISO needs to be: advisory (counsel and direction on a monthly cadence), program ownership (running the security program end to end), or embedded (in your weekly cadence, hands-on, supporting disclosure and audits). Each has a defined scope so you know what you are getting, and there is no open-ended meter running in the background.
What good looks like
The best fractional CISO relationships share a few traits. The advisor is senior, named, and consistent, not a rotating cast of junior staff. They are vendor-neutral, so their advice is about your outcomes and not a product they are trying to sell. And they can operate at the level your situation demands: sitting with your board, standing up to your auditors, and making the calls that carry weight.
If that is the gap you are trying to close, that is what our fractional security leadership is built for.