FlowiseAI Exposes Basic Auth Credentials via API

**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 | faizan@kolega.ai | ### 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.

CVSS 3.0

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity from

GitHub (reviewed advisory)

Weakness

CWE-522

Also known as

CVE-2026-46440

• github.com/FlowiseAI/Flowise/security/advisories/GHSA-php6-83fg-gw3g
• nvd.nist.gov/vuln/detail/CVE-2026-46440
• github.com/FlowiseAI/Flowise
• github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2