Security for SMEs
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Updated November 2, 2026 — Le Chat is now Vibe. As of May 28, 2026, Le Chat has been rebranded as Vibe (still at chat.mistral.ai): a single agent for work and code, carrying over your conversations, settings, and subscriptions. The legacy Le Chat experience remains accessible in Chat mode; in Work mode, agents are now skills (invoked with
@), memories serve as the knowledge base, and deep search is the Deep Research skill. The plans are now called Mistral Free, Pro, Team, and Enterprise. This lesson uses the name Vibe; note that some menus described here may have changed names or locations.
AI security is not optional
Vibe is now part of your daily routine, and perhaps that of your entire team. It’s time to formalize the rules of engagement—not out of paranoia, but out of professionalism, and because the GDPR (General Data Protection Regulation) requires it of you as a data controller. By the end of this lesson, you’ll have what you need to draft an AI usage policy.
What the GDPR expects from you
As a business leader, you are responsible for the personal data processed by your company, including data entrusted to an AI. Mistral acts as your data processor: the regulation imposes obligations on both parties, but you remain accountable for how the data is used.
The first obligation is minimization: transmit only strictly necessary data. To summarize a contract, remove names and contact details beforehand; the summary won’t suffer, since you care about the clauses, not the signatories’ identities. The second is the legal basis—the legitimate reason for processing that data. Legitimate interest covers drafting, analysis, and organization, but it does not cover profiling candidates or customers without their consent. The third is transparency: if you process customer data via AI, you must inform them. Adding a paragraph to your privacy policy satisfies this requirement.
The final two obligations are operational. Security mandates strong passwords for Mistral accounts, a ban on account sharing, and logging out of open sessions. Finally, data subject rights allow a customer or employee to ask what data concerning them has been processed. You can only answer if you maintain a register, even a simple spreadsheet listing processing types and tools used.
What to share and what never to share
The reflex to build boils down to three colors: the red list is an absolute ban, regardless of urgency; the orange list allows sharing after anonymization; the green list poses no issues.
| Level | Data involved | Rule |
|---|---|---|
| Red | Social security numbers, banking details (IBAN, card numbers), passwords and access codes, health data, judicial data, political, religious, or union opinions | Never in Vibe |
| Orange | Customer names and contact details, salaries, performance reviews, contractual data | Anonymize: use initials or pseudonyms, salary ranges, remove payment info |
| Green | Public information (website, social media, directories), non-personal internal data (processes, procedures, templates), aggregated data (total revenue, customer count, trends), marketing content | Free to use |
Remember the logic rather than the list: if data can identify someone or cause them harm, anonymize it before it enters a conversation.
A one-page usage policy
Every SME using AI should have a one-page document answering five questions. Be explicit about authorized tools: “The company authorizes the use of Vibe (Mistral) for professional tasks. The use of other unvalidated AI tools on company data is prohibited.” For data, adapt the three lists above to your industry. For authorized tasks, cite what your team already does: drafting emails, summarizing documents, analyzing non-sensitive data, industry monitoring, and assisting with commercial proposals. For prohibited tasks, name the real risk zones: automated HR decisions like rejecting a candidate based solely on AI, sending customer emails without review, or sharing sensitive medical or financial data. Regarding liability, state that each user is responsible for what they share and identify your AI point of contact.
Have every employee sign this document, just like your IT charter. This isn’t bureaucracy; it’s legal protection for the company and clarity for the team.
Configure settings, one account per person
Ask everyone to review their settings. Conversation sharing for training must be disabled—in Mistral Pro, it is off by default. Require a unique password of at least 12 characters, enable two-factor authentication if available, and regularly check active sessions to spot unknown logins.
One principle admits no exceptions: never share a Vibe account among multiple collaborators. Everyone must have their own account with unique credentials. This is a GDPR requirement—traceability disappears with a shared account—and the foundation of any security policy.
When things go wrong
Two scenarios come up often. If an employee accidentally shares sensitive data:
- Delete the conversation in Vibe
- Log the incident in your register
- Assess the risk (what data, how many people affected)
- If customer personal data is involved, you have 72 hours to notify the CNIL (France’s data protection authority)
If a Mistral account is compromised, the order is equally strict: change the password immediately, revoke MCP connections, check conversation history, then notify your security lead. These reflexes aren’t improvised on the day; integrate them into your usage policy so the first reaction isn’t to hide the incident.
Key takeaways
- The GDPR imposes concrete obligations when you use AI in business
- Classify your data as red (forbidden), orange (with precautions), or green (free)
- Draft a one-page usage policy and have the team sign it
- Every employee must have their own account with a strong password
- In case of an incident involving personal data, you have 72 hours to notify the CNIL