CVE-2026-56271Network attack vector

Unauthenticated account impersonation via hardcoded JWT secrets

Published Jul 12, 2026 · Updated Jul 12, 2026

Authentication bypass in Flowise 3.0.13 and earlier allows remote attackers to impersonate any user by forging JWTs. The enterprise Passport middleware in packages/server/src/enterprise/middleware/passport/index.ts silently substitutes public strings for unset JWT signing, audience, and issuer environment variables. The flaw is reachable only when at least one corresponding variable is unset, after which forged access or refresh tokens grant unauthenticated access to protected endpoints, including administrator functions.

CVSS severity9.3
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Flowise 3.0.13 and earlier allows remote attackers to impersonate any user by forging JWTs. The enterprise Passport middleware in packages/server/src/enterprise/middleware/passport/index.ts silently substitutes public strings for unset JWT signing, audience, and issuer environment variables. The flaw is reachable only when at least one corresponding variable is unset, after which forged access or refresh tokens grant unauthenticated access to protected endpoints, including administrator functions.

The record

CVE
CVE-2026-56271
Published
Jul 12, 2026
Updated
Jul 12, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <3.1.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-321Use of Hard-coded Cryptographic Key
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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