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Credential harvesting is the theft of login information through deception or malicious tooling. A familiar-looking alert can send you to a fake sign-in page, where anything you enter—passwords, one-time codes, or personal details—may go to an attacker. Newer phishing can also target access tokens or trick you into approving an app, so not every account takeover begins with a stolen password.
What credential harvesting is and how it works
The FBI/IC3 describes brand-phishing emails as messages that impersonate prominent companies to trick people into revealing sensitive account information. The attack typically borrows the appearance of a service you recognize, then steers you toward a fraudulent login or authorization step.
- A lure creates urgency or trust. An unexpected account alert, delivery notice, payment issue, or verification request appears to come from a familiar service.
- A link leads to a fake sign-in or authorization flow. The page may imitate the real service, or the prompt may ask you to approve access for an application.
- You enter information or grant access. An attacker may collect a username, password, payment details, personal information, or an authentication code—or obtain permission for an application.
- The attacker tries to use what was captured. Stolen credentials can be used to access the account. An email account is especially valuable because it may expose password-reset messages and security codes for other services.
The FBI/IC3’s November 23, 2021 advisory defines a brand-phishing email this way: “A brand-phishing email is an email cyber criminals send to impersonate the official websites of prominent brands – such as those within the technology, banking, shipping, and retail industries – to trick consumers into revealing sensitive personal account information.” Read the FBI/IC3 advisory.
Why a fake login is not the only way accounts are compromised
Credential harvesting is one route to account compromise, not a complete description of modern phishing. Two FBI/IC3 advisories illustrate why passwords are not the whole story.
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Device-code phishing can target tokens
In May 2026, FBI/IC3 described a device-code phishing campaign that could capture OAuth tokens without intercepting the victim’s credentials. A password may therefore remain unknown to the attacker even while the attacker obtains a way to access an account. See the May 2026 FBI/IC3 advisory.
OAuth consent phishing can create app access
In September 2026, FBI/IC3 described OAuth consent phishing: a victim may authenticate on a legitimate provider page, then approve an attacker-controlled application. The victim may not have entered a password on a fake page, but the application can receive access through the permission granted. Changing the password alone may not revoke that access; remove a suspicious authorized application in the account’s security settings. See the September 2026 FBI/IC3 advisory.
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How to recognize a suspicious login or authorization request
- Unexpected urgency: A message says your account will be closed, a payment failed, a package is held, or verification is immediately required. Treat the message as unverified rather than following its link.
- A lookalike address: Inspect the complete domain, not just a logo, display name, or familiar words in the address. The FBI/IC3 warns that imitation addresses can use lookalike characters.
- An unexpected sign-in page: A page reached through an unsolicited message is not trustworthy merely because it looks polished or uses familiar branding.
- An unfamiliar app asking for access: Read the permission screen. Be wary if you did not expect the application or cannot explain why it needs the requested access.
- A request for a code or approval you did not initiate: Do not share a one-time code or approve an authentication prompt just to clear an alert.
There is no directly comparable prevalence figure for credential harvesting in the official materials cited here. The FTC reported $3.5 billion in consumer losses to imposter scams in 2025, but that is a broad category—not a credential-harvesting or phishing-only estimate. See the FTC’s 2025 imposter-scam figures.
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How to reduce the risk
Verify alerts without using their links
For an unexpected account, payment, delivery, or security alert, open a new browser window and type a known official address, use a saved bookmark, or contact the organization through a channel you have independently verified. Do not use the message’s link or phone number to confirm whether it is genuine. The FBI/IC3 recommends checking addresses carefully and using the organization’s official route. FBI/IC3 guidance on brand phishing.
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Use unique passwords and stronger MFA
Use a different password for each account so that a password exposed at one service does not automatically unlock others. Add multifactor authentication (MFA) where available. MFA methods do not offer equal protection: CISA says phishing-resistant MFA should be the goal and identifies FIDO/WebAuthn as the only widely available phishing-resistant authentication in its consumer guidance. If that is not available, number matching is an interim improvement over simple push approval. Check the service’s own setup and recovery instructions before choosing a method. CISA’s MFA guidance.
The FBI lists software authenticators and USB security keys among MFA options. A FIDO2/WebAuthn-compatible security key can be a useful physical option when your account provider supports it; confirm compatibility and recovery options before relying on one. A key can help resist phishing at supported sign-ins, but it does not stop every token or device-code attack, nor does it prevent someone from granting a malicious app access. FBI/IC3 MFA options.
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Review app permissions before approving
Grant access only to applications you trust and expected to use. Read what the app is allowed to access; if the name or request is unfamiliar, cancel and verify it through the provider’s official account settings. If you already approved a suspicious app, remove it from the account’s security or connected-app settings. A password change by itself may leave the app’s access in place. FBI/IC3 OAuth consent guidance.
What to do if you entered credentials or approved an app
Use the affected service’s official website or app—not a link in the suspicious message—to secure the account. Prioritize the email account if it may be involved, because access to it can expose resets and security codes for other accounts.
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- If you entered a password: Change it on the official service. If you reused it elsewhere, change it on those accounts too, using a unique password for each.
- Review account access: Check recent sessions, devices, recovery email addresses, phone numbers, and security settings. Sign out sessions or remove recovery options you do not recognize.
- If you approved an application: Find connected apps or authorized applications in account security settings and revoke access for anything suspicious. Do not assume a password change removed the permission.
- Secure the email account: Review its password, MFA, recovery methods, forwarding rules, and active sessions. This helps limit access to password-reset messages and security codes for other accounts.
- Report the message: The FTC accepts phishing reports and recommends forwarding phishing emails to the Anti-Phishing Working Group. Follow the reporting options relevant to your country or organization as well. FTC advice on recognizing and reporting phishing.
What the available figures can—and cannot—tell you
The FTC’s 2025 figure provides context for the financial impact of impersonation scams generally, but it does not quantify how often credential harvesting succeeds or compare the effectiveness of passwords, MFA methods, and other defenses. The cited official materials do not establish a directly comparable credential-harvesting prevalence or defense-effectiveness statistic, so a broader fraud number should not be treated as one.
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