Auth bypass in Flowiseai Flowise
CVE-2026-90533
Flowise before 3.1.4 contains a broken access control vulnerability in GET /api/v1/organizationuser that allows any authenticated organization member to retrieve the organization owner's full user record including bcrypt password hash and temporary tokens. Attackers can query the endpoint with any user ID to obtain the owner's credential hash for offline cracking, enabling account takeover of the highest-privileged account.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (26.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-fhxm-xxcx-g6x3 (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/flowise-before-3.1.4-broken-access-control-via-org… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-90533?
- CVE-2026-90533 is a medium-severity vulnerability in Flowiseai Flowise, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-12.
- How severe is CVE-2026-90533?
- Medium severity. CVSS v3 base score is 6.5 out of 10.