CVE-2026-56270 | THREATINT

Description

Flowise before 3.1.0 (versions 3.0.13 and earlier) contains a missing authentication vulnerability in the /api/v1/loginmethod endpoint that allows unauthenticated users to retrieve an organization's complete SSO configuration, including OAuth client secrets in cleartext, by providing an organizationId parameter. Remote attackers can send a GET request to harvest sensitive API credentials for Google, Microsoft/Azure, GitHub, and Auth0 integrations. This affects FlowiseAI Cloud and self-hosted instances where the endpoint is exposed.

PUBLISHED Reserved 2026-06-20 | Published 2026-06-24 | Updated 2026-06-24 | Assigner VulnCheck

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem types

Missing Authentication for Critical Function

Product status

Default status

unaffected

Any version before 3.1.0

affected

3.1.0 (semver)

unaffected

Credits

berkdedekarginoglu reporter

References

github.com/...lowise/security/advisories/GHSA-6pcv-j4jx-m4vx exploit

github.com/...lowise/security/advisories/GHSA-6pcv-j4jx-m4vx (GitHub Security Advisory (GHSA-6pcv-j4jx-m4vx)) vendor-advisory

www.vulncheck.com/...closure-via-api-v1-loginmethod-endpoint (VulnCheck Advisory: Flowise - Unauthenticated OAuth Secrets Disclosure via /api/v1/loginmethod Endpoint) third-party-advisory

cve.org (CVE-2026-56270)

nvd.nist.gov (CVE-2026-56270)

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