Yes. Criminals have stolen AI-service accounts and API keys, while researchers have documented infostealers collecting AI developer configuration files and malware campaigns using fake AI apps as lures. That establishes a real threat—not a measured compromise rate across all AI providers. Your best defenses depend on what an attacker targets: a password, a logged-in browser session, or an API key on your device.
What attackers are targeting
AI access is not just a username and password. Attackers may go after interactive accounts, browser sessions, or the secrets that let developer tools connect to AI services.
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- Account credentials: Check Point Research’s AI Security Report 2025 describes stolen ChatGPT accounts, OpenAI API keys, and credentials for other large language model platforms being offered on criminal markets. It identifies credential stuffing, phishing, and infostealer infections as ways to obtain them. Stolen access can be useful for bypassing usage limits or using services anonymously.
- Browser sessions: Infostealers can collect browser credentials and session tokens. A stolen session may let an attacker access an account without repeating the normal password sign-in.
- Developer configuration files and API keys: Google Threat Intelligence Group reported in 2026 that infostealer commands targeted AI developer configuration files, including Cline’s
secrets.jsonand Continue AI’sconfig.yaml. These files can contain plaintext API keys and custom routing endpoints. Google also described DUSTMAKER credential-stealer activity involving AI coding environments and developer systems. This does not mean every AI tool stores secrets in plaintext.
The evidence shows real examples and criminal interest, but does not establish how often AI accounts are compromised across providers or users.
How the attacks happen
Password reuse and credential stuffing
Credential stuffing is the automated testing of stolen username-and-password combinations against other services. If you reuse a password, a breach elsewhere can put your AI account at risk even if the AI provider itself was not breached. A unique password prevents that particular reuse path.
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Phishing and session theft
A convincing sign-in prompt can trick someone into handing over credentials, while malware may steal saved logins or browser session tokens from an infected device. Multifactor authentication can make password-only access harder, but it does not automatically invalidate a session already copied by an attacker.
Fake AI apps and extensions
Malware distributors can borrow the name of a popular AI service to make a download or extension seem legitimate. ESET’s H1 2024 report documented a fake Midjourney installer delivering Vidar and a malicious browser-extension campaign using Sora and Gemini as lures. ESET telemetry recorded more than 4,000 attempts to install that extension since August 2023; the figure counts attempts, not confirmed infections or AI-account theft.
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Branding alone does not establish that an installer, extension, or sign-in page is official. Go to the provider’s verified website or the app store listing linked from it instead of following an ad or an unfamiliar download page.
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| Control | What it helps address | What it does not do by itself |
|---|---|---|
| Unique account password | Reduces risk from password reuse and credential stuffing. | Does not prevent phishing, malware, or theft of an already-authenticated session. |
| Phishing-resistant MFA or passkey | Adds resistance to account takeovers that rely on a stolen password, when the provider supports the method. | Does not remove a stolen browser session or protect an exposed API key. |
| API-key limits and rotation | Restricts or replaces programmatic credentials used by applications and developer tools. | Does not secure an interactive account or clean an infected device. |
| Endpoint protection and trusted downloads | May help detect or block malware; verified sources reduce the chance of installing an impostor app. | Does not invalidate credentials or sessions already copied off the device. |
Microsoft’s 2025 security article says phishing-resistant MFA can stop over 99% of the type of identity attack it discusses, even when an attacker has the correct username and password. That figure is scoped to the described attack type; it is not a guarantee against every route to account or key theft. Microsoft’s Digital Defense Report 2026 says 52.2% of valid account intrusions involved follow-on credential theft. That is broad identity data, not an AI-account compromise rate. The report also observes: “As AI becomes ubiquitous in the workplace and at home, it has become both a tool and a target for attackers.”
How to protect an AI account and its API keys
- Use a unique password. Do not reuse your AI account password on another service. A password manager can help you create and retain distinct credentials.
- Enable the strongest sign-in method the provider offers. Prefer phishing-resistant MFA or a passkey when available. Check the provider’s current account-security settings; support varies by service and account.
- Get apps and extensions from verified sources. Navigate to the AI provider’s official site and follow its link to the relevant store listing. Do not treat an ad, search result, familiar logo, or product name as proof of authenticity.
- Treat developer secrets as credentials. Protect API keys and configuration files used by coding assistants. Avoid storing secrets in plaintext where feasible, keep access limited to what a tool needs, and monitor for unusual usage.
- Include AI tools in work security controls. Organizations should limit key privileges and include relevant developer systems, endpoints, and AI accounts in identity and incident-response processes.
What to do if you suspect compromise
Act on the credential as well as the device. Removing malware alone cannot undo a key or session token that has already been copied.
- Use the provider’s account controls to revoke active sessions. This addresses stolen browser access where the provider offers session management.
- Reset the account password to a new, unique one, and review sign-in security settings.
- Revoke and rotate exposed API keys. Replace any key that may have been stored in an exposed configuration file, then update legitimate applications that depend on it.
- Review account activity, usage, and billing. Look for unfamiliar sign-ins or unexpected API calls and follow the provider’s reporting process if you find them.
- Investigate and clean the device. Use trusted security support or your organization’s incident-response process if malware is suspected. Do not assume endpoint cleanup alone has revoked copied secrets.
Provider menus and recovery procedures differ, so use the service’s current official guidance for exact steps.
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