EUVD-2025-210337Published

Flowise - Authentication Bypass via Unprotected Registration Endpoint

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2025-71327

Published

Flowise contains an authentication bypass vulnerability in the unprotected /api/v1/account/register endpoint that allows unauthenticated attackers to create user accounts. Remote attackers can exploit this endpoint to register arbitrary accounts and authenticate to the system, gaining full API access without credentials.

Source published: 25 Jun 2026 21:41:03 UTC
Source modified: 26 Jun 2026 12:46:22 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 4.0 · 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

euvd · EUVD-2025-210337

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 25, 2026, 9:41:03 PM

dateUpdated: Jun 26, 2026, 12:46:22 PM

Source published: Jun 25, 2026, 9:41:03 PM (timezone not stated)
Source modified: Jun 26, 2026, 12:46:22 PM (timezone not stated)
Observed here: 9 Nov 2026 04:12:45 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

nvd · CVE-2025-71327

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-306

Original publisher date fields

published: 2026-06-25T22:16:58.740

lastModified: 2026-10-12T21:10:00.227

1 source CPE criteria · context only

cpe:2.3:a:flowiseai:flowise:3.0.1:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 25 Jun 2026 22:16:58 UTC
Source modified: 12 Oct 2026 21:10:00 UTC
Observed here: 25 Oct 2026 04:17:18 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 4.0 · [email protected] · Secondary · 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/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 3.1 · [email protected] · Secondary · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

osv · GHSA-v5w9-prxf-w882

Published

### Summary An unauthenticated attacker can exploit the unprotected registration endpoint (/register) to create a new user and bypass authentication. ### Details Critical vulnerability in Flowise 3.0.1 on-premise deployment allows unauthenticated attackers to exploit the /api/v1/account/register endpoint to add a new user and log in using it, enabling authentication bypass. Meaning that the register functionality is by default open, allowing attackers to create an account and use the api without any restrictions or credentials. ### PoC A Flowise 3.0.1 instance was deployed via Docker for the purpose of this demonstration. ![1 Docker](https://github.com/user-attachments/assets/fb0b8627-63e3-4523-881f-a0ff6352b678) After successful deployment the instance setup organization page allows us to register the first account in the system. ![1 newly deployed instance](https://github.com/user-attachments/assets/39d56738-eb97-469e-b96e-61cd7cec64a8) Creating the first user [[email protected]](mailto:[email protected]) ![2 configuring account](https://github.com/user-attachments/assets/5fb94b35-c180-4d77-b209-dcff7043c457) Login to the account ![2 Login](https://github.com/user-attachments/assets/557e8268-099a-4519-bf86-b96a7c5f19ff) The background request that created the first user to /api/v1/account/register ![3 request](https://github.com/user-attachments/assets/b74b876d-b784-4142-9d46-10e90ff1b780) Response ![3 1 response](https://github.com/user-attachments/assets/db769da7-d241-4f0b-a99f-821fa5fdcf05) We have found that it is possible to reuse the registration request multiple times without any restrictions to create an account and authenticate to the system using it. Crafting a new request { "user": { "name": "Malicious", "email": "[email protected]", "type": "pro", "credential": "Password123!" } } ![4 attacker new register](https://github.com/user-attachments/assets/ee34b9f9-7e03-4198-affa-cf2dd2f84666) Response with 201 code “Created” ![4 1 created](https://github.com/user-attachments/assets/e2a49518-1566-4fe0-9cc5-2a496265974a) Login using newly created user (attacker) ![5 Login using attacker](https://github.com/user-attachments/assets/b6ef7eb2-d388-469d-92d7-0ca50cdd9873) Success login ![6 Susccess auth bypass](https://github.com/user-attachments/assets/044376d8-f9c5-4de7-a53c-05dd2c66de83) An unauthorized user can exploit this vulnerability to register an account and gain access to the Flowise API with authenticated privileges, effectively bypassing authentication. ### Impact This is an authentication bypass vulnerability caused by an unprotected registration endpoint (/register). Users of Flowise 3.0.1(latest) on-premise deployments are impacted. An unauthorized attacker can exploit this vulnerability to register an account after the organization set has been completed, and gain access to the Flowise API with authenticated privileges, effectively bypassing authentication.

Source published: 17 Nov 2025 19:06:09 UTC
Source modified: 8 Jul 2026 07:10:44 UTC
Observed here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Publisher rating · HIGH