CVE-2026-56271 (GCVE-0-2026-56271)
Vulnerability from cvelistv5 – Published: 2026-07-12 12:06 – Updated: 2026-07-13 15:41Title
Flowise - Weak Default JWT Secrets in Authentication Middleware
Summary
Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses weak hardcoded default JWT secrets ('auth_token', 'refresh_token') and default audience and issuer values ('AUDIENCE', 'ISSUER') in the enterprise passport authentication middleware (packages/server/src/enterprise/middleware/passport/index.ts). When the corresponding environment variables (JWT_AUTH_TOKEN_SECRET, JWT_REFRESH_TOKEN_SECRET, JWT_AUDIENCE, JWT_ISSUER) are not set, the application silently falls back to these publicly known defaults, allowing an attacker to forge valid JWTs and impersonate any user, including administrators, resulting in authentication bypass.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 15:41 UTC
CWE
- CWE-321 - Use of Hard-coded Cryptographic Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/FlowiseAI/Flowise/security/adv… | vendor-advisory |
| https://www.vulncheck.com/advisories/flowise-weak… | third-party-advisory |
Impacted products
Date Public
2026-04-15 00:00
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 19974dd3-6491-475e-86c3-fd4ddcafc724
Exploited: Yes
Timestamps
First Seen: 2026-09-22
Asserted: 2026-09-22
Scope
Notes: Flowise - Weak Default JWT Secrets in Authentication Middleware | Affected: Flowise / Flowise | CVSS: 9.3 (CRITICAL) | EPSS: 0.00655 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Flowise - Weak Default JWT Secrets in Authentication Middleware |
| Cve Id | CVE-2026-56271 |
| Vendor | Flowise |
| Ghsa Id | None |
| Product | Flowise |
| Added Date | 2026-09-22T11:32:55.153Z |
| Cvss Score | 9.3 |
| Epss Score | 0.00655 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.49936 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-56271 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-09-23 12:00 UTC
| Updated: 2026-09-23 12:00 UTC
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