Vulnerability in Flowise
CVE-2026-56271
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Flowise — versions 0, 3.1.0
- Flowiseai Flowise
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-cc4f-hjpj-g9p8 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/flowise-weak-default-jwt-secrets-in-authentication… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56271?
- CVE-2026-56271 is a critical-severity vulnerability in Flowise, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.8/10. Published 2026-07-12.
- How severe is CVE-2026-56271?
- Critical severity. CVSS v3 base score is 9.8 out of 10.