Flowise: Improper Authentication (CVE-2026-100606)

What is affected, what to do

Flowise through 3.1.4 (Enterprise/platform mode with SSO enabled) contains an authentication bypass in the SSO login path. When an SSO callback arrives with an email matching a user whose status is INVITED, verifyAndLogin (SSOBase.ts:80-94) copies the user record from the database — including the server-stored single-use invitation tempToken — into the data passed to AccountService.register().

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected

• Flowise lte *..3.1.4

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Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

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From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Flowise through 3.1.4 (Enterprise/platform mode with SSO enabled) contains an authentication bypass in the SSO login path. When an SSO callback arrives with an email matching a user whose status is INVITED, verifyAndLogin (SSOBase.ts:80-94) copies the user record from the database — including the server-stored single-use invitation tempToken — into the data passed to AccountService.register(). The register handler's token lookup, email match, and expiry checks therefore pass trivially against the server's own token instead of a caller-supplied one, and the account and its organization membership are flipped to ACTIVE. As a result, anyone able to authenticate at any configured SSO provider using a pending invitee's email address as the email claim can take over that invitation and obtain the invited user's access to the organization without ever possessing the emailed invitation token, for as long as the invitation is valid (24 hours by default). At the time of the advisory no patched version was available.

Source: BSI WID Portal

Vendors and products

• FlowiseAI Flowise
• Open Source Flowise

Weakness classes (CWE)

• CWE-287Improper Authentication

  Class

  When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

  Entry at MITRE CWE-287

References & sources

• github.comGitHub Security Advisory (GHSA-jvx3-mjpw-r4gh)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Missing Authorization via upsert-historyThird-party advisory
• github.comGitHub Security Advisory (GHSA-vf3j-89vf-r697)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Authentication Bypass via SSO Email MatchThird-party advisory
• github.comGitHub Security Advisory (GHSA-rpcc-gw54-mfgx)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Authorization Bypass via BullMQ DashboardThird-party advisory
• github.comGitHub Security Advisory (GHSA-ppmg-4cx6-95hh)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Missing Authorization via Chat Message RoutesThird-party advisory
• github.comGitHub Security Advisory (GHSA-cffm-583c-vffr)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Authentication Bypass via Email-Only SSOThird-party advisory
• github.comGitHub Security Advisory (GHSA-27w2-26m5-x82c)Vendor advisory
• vulncheck.comVulnCheck Advisory: Flowise through 3.1.4 Insecure Direct Object Reference via CredentialThird-party advisory

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 28.09.2026Record modifiedCISA ADP

   CISA assessment (SSVC): exploitation: proof of concept, automatable: no

   New references:

   • https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vf3j-89vf-r697
   Show 2 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Reference	added	—	https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vf3j-89vf-r697
   SSVC assessment	added	—	{"id":"CVE-2026-100606","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-09-28T19:08:17.212056Z"}

   Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

2. 26.09.2026ReceivedVulnCheck

   CVSS V4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

   CVSS V3.1: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

   Weakness type: CWE-287

   Description added or changed

   New references:

   • https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vf3j-89vf-r697
   • https://www.vulncheck.com/advisories/flowise-through-3.1.4-authentication-bypass-via-sso-email-match
   Show 7 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Description	added	—	Flowise through 3.1.4 (Enterprise/platform mode with SSO enabled) contains an authentication bypass in the SSO login path. When an SSO callback arrives with an email matching a user whose status is INVITED, verifyAndLogin (SSOBase.ts:80-94) copies the user record from the database — including the server-stored single-use invitation tempToken — into the data passed to AccountService.register(). The register handler's token lookup, email match, and expiry checks therefore pass trivially against the server's own token instead of a caller-supplied one, and the account and its organization membership are flipped to ACTIVE. As a result, anyone able to authenticate at any configured SSO provider using a pending invitee's email address as the email claim can take over that invitation and obtain the invited user's access to the organization without ever possessing the emailed invitation token, for as long as the invitation is valid (24 hours by default). At the time of the advisory no patched version was available.
   CVSS	added	—	AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
   CVSS	added	—	AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
   Weakness type (CWE)	added	—	CWE-287
   Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100606.json">CVE-2026-100606</a>
   Reference	added	—	https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vf3j-89vf-r697
   Reference	added	—	https://www.vulncheck.com/advisories/flowise-through-3.1.4-authentication-bypass-via-sso-email-match

   Source identifier: disclosure@vulncheck.com