Flowise before 3.1.3 IDOR via customer-default-source endpoint

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.

Flowise versions before 3.1.3 contain an insecure direct object reference vulnerability in the GET /api/v1/organization/customer-default-source endpoint that allows authenticated attackers to access other customers' payment and profile data by manipulating the customerId parameter. Attackers can enumerate predictable customer IDs to retrieve sensitive information including email addresses, account balances, currency types, and billing configurations without authorization checks.

Source published

13 Aug 2026 11:28:07 UTC

Source modified

13 Aug 2026 14:51:27 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 4.0 · 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Flowise versions before 3.1.3 contain an insecure direct object reference vulnerability in the GET /api/v1/organization/customer-default-source endpoint that allows authenticated attackers to access other customers' payment and profile data by manipulating the customerId parameter. Attackers can enumerate predictable customer IDs to retrieve sensitive information including email addresses, account balances, currency types, and billing configurations without authorization checks.

Source published

13 Aug 2026 12:17:24 UTC

Source modified

24 Oct 2026 15:10:00 UTC

Observed here

25 Oct 2026 15:19:09 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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] · Primary · 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

### Summary An Insecure Direct Object Reference (IDOR) vulnerability exists at the **GET /api/v1/organization/customer-default-source** endpoint. This flaw allows an authenticated attacker to bypass authorization checks and retrieve sensitive payment and profile information of other customers by manipulating the customerId parameter. The exposed data includes email addresses, account balances, currency types, and internal billing configurations. ### Details The application fails to implement proper object-level access control. While the endpoint requires a valid session/token, it does not verify if the requesting user has the authority to access the specific customerId provided in the query string. When a request is made to: GET /api/v1/organization/customer-default-source?customerId=cus_XXXX The server processes the request based solely on the existence of a valid session, returning the data associated with the ID regardless of the data owner's identity. Since customer IDs follow a predictable pattern (Stripe-formatted cus_...), an attacker could potentially enumerate these IDs to scrape customer data. ### PoC 1. To reproduce the vulnerability, follow these steps: 2. Log in to your account at cloud.flowiseai.com. 3. Capture a request to the payment source endpoint using a proxy tool (e.g., Burp Suite). 4. Change the customerId parameter in the URL to a target user's ID (e.g., cus_U9ajkQvu0e67uH). Execute the request: ``` GET /api/v1/organization/customer-default-source?customerId=cus_U9ajkQvu0e67uH HTTP/2 Host: cloud.flowiseai.com Cookie: [YOUR_AUTHENTICATED_COOKIES] ... ``` Response: ``` { "id": "cus_U9ajkQvu0e67uH", "object": "customer", "email": "[email protected]", "balance": 0, "currency": "usd", "invoice_settings": { "custom_fields": null, "default_payment_method": null }, "livemode": true ... } ``` The server returns a 200 OK status with the private data of the target customer. ### Impact - Vulnerability Type: Broken Access Control (IDOR). - Impacted Parties: All registered users and organizations on the FlowiseAI Cloud platform. - Consequences: * Data Privacy Breach: Exposure of Personally Identifiable Information (PII) such as email addresses. - Financial Information Leakage: Disclosure of account balances, currency settings, and invoice metadata. - Compliance Risk: Potential violation of data protection regulations (e.g., GDPR) due to unauthorized access to user billing profiles.

Source published

4 Aug 2026 14:16:46 UTC

Source modified

14 Aug 2026 04:12:11 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:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Publisher rating · MODERATE