As artificial intelligence becomes more widely used in recruitment, candidates are finding new ways to influence the technology assessing their applications.
One emerging tactic is the use of hidden AI prompts within CVs. Concealed using techniques such as white text, small font sizes or hidden formatting, these instructions are designed to influence AI-powered recruitment tools without being visible to the recruiter reviewing the document.
Prompts might instruct an AI system to prioritise a candidate, rank an application more favourably or recommend progression to the next stage.
For organisations relying heavily on automated CV screening, this presents a new recruitment risk.
How Do Hidden AI Prompts Work?
Hidden AI prompts are a form of prompt injection. Rather than providing information for the recruiter, a candidate places instructions within their CV intended for the AI system processing it.
How effective these prompts are will depend on the technology being used and the safeguards in place. However, where AI is used to interpret candidate-supplied information, organisations need to consider whether that information could influence the technology assessing it.
The issue highlights a wider challenge: AI recruitment tools are analysing information that has ultimately been selected, created and controlled by the candidate.
How Can Employers Find Hidden AI Prompts in CVs?
Some hidden prompts can be uncovered using relatively simple checks.
Recruiters can select all text within a document to reveal concealed wording, change font or background colours to expose white text, check for unusually small font sizes and copy CV content into a plain-text editor.
These steps will not identify every attempt to influence an AI system. Organisations using AI-powered recruitment tools should also understand how their technology processes candidate documents and what safeguards are in place against prompt injection.
Why Does This Matter for Recruitment Due Diligence?
Finding hidden instructions addresses the immediate problem, but it also raises a wider recruitment issue.
As candidates gain access to increasingly sophisticated tools for creating and optimising applications, independent recruitment due diligence becomes increasingly important.
Appropriate pre-employment screening can provide additional sources of information beyond the CV, including identity and Right to Work checks, employment and qualification verification, references, adverse media screening and Social Media Checks.
Rather than relying heavily on a single source of candidate-controlled information, these checks can help organisations build a more complete and informed picture
Where Do Social Media Checks Fit?
A Social Media Check provides an additional layer of due diligence by reviewing relevant, publicly available online information that may not be identified through traditional recruitment screening.
This information is not limited to what a candidate has chosen to present within their CV or application. When conducted fairly, consistently and proportionately, Social Media Checks can help organisations identify relevant online conduct risks while supporting informed recruitment decisions.
At SP Index, our approach is human-led and technology-fed. Technology supports the screening process, while trained analysts review relevant findings in context rather than relying on automated decision-making alone.
AI will continue to change both how candidates apply for roles and how organisations screen them.
The answer is not to remove technology from recruitment. It is to combine technology with independent due diligence, robust processes and informed human judgement.
Learn more about Social Media Checks
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Learn more about our Social Media Checks
Telephone: +44 333 210 1688
Email: info@sp-index.com
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