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 ('AUDIENC
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56271
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-562710.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56271 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Flowise
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] Flowise: Multiple vulnerabilitiescert-bund · 2026-07-30
- medium[NEW] [medium] Flowise: Multiple vulnerabilitiescert-bund · 2026-07-28
- high[UPDATE] [high] Flowise: Multiple vulnerabilitiescert-bund · 2026-07-13
- critical[UPDATE] [critical] Flowise: Multiple vulnerabilitiescert-bund · 2026-07-10
- mediumCVE-2026-56273: Flowise before 3.1.0 contains a path traversal vulnerability in Faiss and SimpleStore vector s…nvd · 2026-07-08
- criticalCVE-2026-56278: Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secr…nvd · 2026-06-30
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