PT-2026-41205 · Npm · Flowise

Published

2026-05-14

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Updated

2026-05-14

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CVE-2026-46440

CVSS v3.1

7.5

High

VectorAV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Detection Method: Kolega.dev Deep Code Scan
AttributeValue
SeverityMedium
CWECWE-522 (Insufficiently Protected Credentials)
Locationpackages/server/src/enterprise/controllers/account.controller.ts:128-135
Practical ExploitabilityMedium
Developer Approverfaizan@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.

Fix

Insufficiently Protected Credentials

Weakness Enumeration

CWE-522

Related Identifiers

CVE-2026-46440
GHSA-PHP6-83FG-GW3G

Affected Products

Flowise