Advisory details:
github_osv / GHSA-php6-83fg-gw3g
| Advisory ID | github_osv/GHSA-php6-83fg-gw3g |
| Aliases |
CVE-2026-46440
|
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3 | 7.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-php6-83fg-gw3g/GHSA-php6-83fg-gw3g.json |
| generic_textual | HIGH |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-06-08T19:18:05Z/
Decision: Track*
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/46xxx/CVE-2026-46440.json
Source Advisory: vulnrichment/CVE-2026-46440
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]