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CVE-2026-4894

Status: DeferredMedium (6.9)—

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:

Technical details traces, logs and code from the original report
  *  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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector N/N sin autenticación permite explotar fallo de validación en endpoint expuesto; atacante obtiene OTP (T1552.007) e impersona cuentas (T1078) sin acceso legítimo a buzones.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account ManagementUser Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Developer GuidanceActive Directory Configuration

Affected technologies (2)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Frappe — ErpnextAIFrappe — Frappe CloudAI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-4894",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
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        "ssvcData": {
          "id": "CVE-2026-4894",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-08T13:57:37.828083Z"
        }
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    "cvssMetricV40": [
      {
        "type": "Secondary",
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        "cvssData": {
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          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.9,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  },
  "affected": [
    {
      "source": "cve-coordination@incibe.es",
      "affectedData": [
        {
          "vendor": "Frappe Technologies",
          "product": "Frappe Technologies",
          "versions": [
            {
              "status": "affected",
              "version": "Version before 23/03/2026"
            }
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  "published": "2026-10-08T09:16:41.477",
  "references": [
    {
      "url": "https://www.incibe.es/en/incibe-cert/notices/aviso/authentication-bypass-multiple-products-frappe-technologies",
      "source": "cve-coordination@incibe.es"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
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      "description": [
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          "value": "CWE-290"
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  "descriptions": [
    {
      "lang": "en",
      "value": "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.\nThe 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:\n\n  *  Obtain the authentication OTP;\n  *  Impersonate someone else in the registration process;\n  *  Register accounts using other people's email addresses without access to the mailbox;\n  *  Indirectly confirm the existence of already registered email addresses."
    }
  ],
  "lastModified": "2026-10-08T21:04:18.423",
  "sourceIdentifier": "cve-coordination@incibe.es"
}