CVE-2026-46440

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, the checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison. This issue has been patched in version 3.1.2.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, the checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison. This issue has been patched in version 3.1.2.

Detection Method: Kolega.dev Deep Code Scan

| Attribute | Value | |---|---| | Severity | Medium | | CWE | CWE-522 (Insufficiently Protected Credentials) | | Location | packages/server/src/enterprise/controllers/account.controller.ts:128-135 | | Practical Exploitability | Medium | | Developer Approver | [email protected] |

Description

The checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison.

Affected Code

public async checkBasicAuth(req: Request, res: Response) {
    const { username, password } = req.body
    if (username === process.env.FLOWISE_USERNAME && password === process.env.FLOWISE_PASSWORD) {
        return res.json({ message: 'Authentication successful' })

Evidence

Credentials are sent in plaintext in request body and compared directly without hashing. No rate limiting prevents brute force attacks. The endpoint returns different messages for success/failure, enabling enumeration.

Impact

Credential brute-forcing - attackers can attempt unlimited username/password combinations against the basic auth system. Successful attacks grant access to the application.

Recommendation

1. Implement rate limiting on this endpoint, 2) Use constant-time comparison to prevent timing attacks, 3) Consider using hashed comparison, 4) Return generic error messages, 5) Add logging for failed attempts.

Notes

The checkBasicAuth endpoint at line 128-135 has multiple security issues: (1) No rate limiting - the RateLimiterManager only applies to chatflow-specific endpoints, not auth endpoints. Attackers can perform unlimited brute force attempts. (2) Uses JavaScript === operator for comparison which is not constant-time, potentially enabling timing attacks. (3) Returns different messages for success ('Authentication successful') vs failure ('Authentication failed'), enabling credential enumeration. The endpoint compares plaintext credentials against environment variables FLOWISE_USERNAME and FLOWISE_PASSWORD. While this is basic auth for simpler deployments, the lack of rate limiting makes it actively exploitable for credential brute-forcing.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, the checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison. This issue has been patched in version 3.1.2.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, the checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison. This issue has been patched in version 3.1.2.

Detection Method: Kolega.dev Deep Code Scan

| Attribute | Value | |---|---| | Severity | Medium | | CWE | CWE-522 (Insufficiently Protected Credentials) | | Location | packages/server/src/enterprise/controllers/account.controller.ts:128-135 | | Practical Exploitability | Medium | | Developer Approver | [email protected] |

Description

The checkBasicAuth endpoint validates credentials in plaintext without rate limiting and with direct comparison.

Affected Code

public async checkBasicAuth(req: Request, res: Response) {
    const { username, password } = req.body
    if (username === process.env.FLOWISE_USERNAME && password === process.env.FLOWISE_PASSWORD) {
        return res.json({ message: 'Authentication successful' })

Evidence

Credentials are sent in plaintext in request body and compared directly without hashing. No rate limiting prevents brute force attacks. The endpoint returns different messages for success/failure, enabling enumeration.

Impact

Credential brute-forcing - attackers can attempt unlimited username/password combinations against the basic auth system. Successful attacks grant access to the application.

Recommendation

1. Implement rate limiting on this endpoint, 2) Use constant-time comparison to prevent timing attacks, 3) Consider using hashed comparison, 4) Return generic error messages, 5) Add logging for failed attempts.

Notes

The checkBasicAuth endpoint at line 128-135 has multiple security issues: (1) No rate limiting - the RateLimiterManager only applies to chatflow-specific endpoints, not auth endpoints. Attackers can perform unlimited brute force attempts. (2) Uses JavaScript === operator for comparison which is not constant-time, potentially enabling timing attacks. (3) Returns different messages for success ('Authentication successful') vs failure ('Authentication failed'), enabling credential enumeration. The endpoint compares plaintext credentials against environment variables FLOWISE_USERNAME and FLOWISE_PASSWORD. While this is basic auth for simpler deployments, the lack of rate limiting makes it actively exploitable for credential brute-forcing.