FlowiseAI Flowise up to 3.1.4 SSO call SSOBase.ts AccountService.register improper authentication

Summaryinfo

A vulnerability categorized as critical has been discovered in FlowiseAI Flowise up to 3.1.4. This impacts the function AccountService.register of the file SSOBase.ts of the component SSO call Handler. The manipulation results in improper authentication. This vulnerability was named CVE-2026-100606. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in FlowiseAI Flowise up to 3.1.4. Affected is the function AccountService.register of the file SSOBase.ts of the component SSO call Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-100606 since 09/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• FlowiseAI

Name

• Flowise

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4

Website

• Product: https://github.com/FlowiseAI/Flowise/

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