CVE-2026-4894: Authentication bypass in multiple products from Frappe Technologies
A vulnerability has been identified regarding insufficient validation in the Frappe Cloud/ERPNext authentication process, which allows multiple email addresses to be accepted by manipulating the email field in the /api/method/press.api.account.signup endpoint. The vulnerability occurs when an unauthenticated remote attacker adds more than one email address. The service processes the entire value as a valid list of recipients and sends the OTP code to all addresses without proper validation of all added emails (only one of them needs to be valid). Exploiting this vulnerability would allow an attacker to:
Obtain the authentication OTP; Impersonate someone else in the registration process; Register accounts using other people's email addresses without access to the mailbox; Indirectly confirm the existence of already registered email addresses.
Affected Software
Event History
Frequently Asked Questions
Does exploiting this issue require an authenticated account or user interaction?
No. The CVSS vector indicates network-based exploitation with no privileges required and no user interaction.
What input condition is required for the OTP delivery flaw to occur?
The attacker must submit more than one email address in the email field of the /api/method/press.api.account.signup endpoint. Only one of the supplied addresses needs to be valid for the service to process the value as a recipient list and send the OTP to all listed addresses.
What could an attacker do after successfully exploiting the issue?
An attacker could obtain an authentication OTP, impersonate someone during registration, register accounts with another person's email address without mailbox access, and indirectly test whether email addresses are already registered.