CVE-2026-4894 Details
Description
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.
A vulnerability exists in the Frappe Cloud and ERPNext authentication processes due to inadequate validation of email addresses in the signup API endpoint. This flaw enables unauthenticated remote attackers to submit multiple email addresses, with the service erroneously treating all of them as valid recipients. As a result, an OTP is sent to each address without proper verification, creating opportunities for exploitation. This vulnerability could lead to unauthorized access to OTPs, impersonation during registration, and the ability to register accounts using other people's email addresses, all while confirming the existence of already registered addresses.
Frappe Technologies has released a fix for this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 8, 2026CISA-ADP
Assessed Oct 8, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.incibe.es/en/incibe-cert/notices/aviso/authentication-bypass-multiple-products-frappe-technologies | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-290 | Authentication Bypass by Spoofing | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Frappe Cloud | All versions |
CPE
Remediation
| |
| Frappe ERPNext | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 8, 2026 | CVE Modified | CISA-ADP |
| Oct 8, 2026 | New CVE Received | [email protected] |