CVE-2026-30823

The Flowise platform has a critical Insecure Direct Object Reference (IDOR) vulnerability combined with a Business Logic Flaw in the PUT /api/v1/loginmethod endpoint.

While the endpoint requires authentication, it fails to validate if the authenticated user has ownership or administrative rights over the target organizationId. This allows any low-privileged user (including "Free" plan users) to:

1. Overwrite the SSO configuration of any other organization.
2. Enable "Enterprise-only" features (SSO/SAML) without a license.
3. Perform Account Takeover by redirecting the authentication flow.

Details

The backend accepts the organizationId parameter from the JSON body and updates the database record corresponding to that ID. There is no middleware or logic check to ensure request.user.organizationId === body.organizationId.

PoC

Prerequisites:

1. The attacker creates a standard "Free" account and obtains a valid JWT token (Cookie/Header).
2. The attacker identifies the target organizationId (e.g., bd2b74e0-e0cd-4bb5-ba98-3cc2ae683d5d).

Step-by-Step Exploitation: The attacker sends the following PUT request to overwrite the victim's Google SSO configuration.

Request:

PUT /api/v1/loginmethod HTTP/2
Host: cloud.flowiseai.com
Cookie: token=<ATTACKER_JWT_TOKEN>
Content-Type: application/json
Accept: application/json

{
  "organizationId": "bd2b74e0-e0cd-4bb5-ba98-3cc2ae683d5d",
  "userId": "6ab311fa-0d0a-4bd6-996e-4ae721377fb2", 
  "providers": [
    {
      "providerLabel": "Google",
      "providerName": "google",
      "config": {
        "clientID": "ATTACKER_MALICIOUS_CLIENT_ID",
        "clientSecret": "ATTACKER_MALICIOUS_SECRET"
      },
      "status": "enable"
    }
  ]
}

Response: The server responds with 200 OK, confirming the modification has been applied to the victim's organization context.

{
  "status": "OK",
  "organizationId": "bd2b74e0-e0cd-4bb5-ba98-3cc2ae683d5d"
}

• Account Takeover: An attacker can replace a victim organization's legitimate OAuth credentials (e.g., Google Client ID) with their own malicious application credentials. When victim employees try to log in via SSO, they are authenticated against the attacker's application, potentially allowing the attacker to hijack sessions or steal credentials.
• License Control Bypass: Users on the "Free" tier can illicitly enable and configure SSO providers (Azure, Okta, etc.), which are features strictly restricted to the "Enterprise" plan.

The application does not perform an authorization check before performing a sensitive operation. Typical impact: unauthorized access to restricted functionality or data.

CVE-2026-30823 has a CVSS score of 8.8 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.0.13); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-30823? CVE-2026-30823 is a high-severity missing authorization vulnerability in flowise (npm), affecting versions <= 3.0.12. It is fixed in 3.0.13. The application does not perform an authorization check before performing a sensitive operation.
2. How severe is CVE-2026-30823? CVE-2026-30823 has a CVSS score of 8.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of flowise are affected by CVE-2026-30823? flowise (npm) versions <= 3.0.12 is affected.
4. Is there a fix for CVE-2026-30823? Yes. CVE-2026-30823 is fixed in 3.0.13. Upgrade to this version or later.
5. Is CVE-2026-30823 exploitable, and should I be worried? Whether CVE-2026-30823 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-30823 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-30823? Upgrade flowise to 3.0.13 or later.