Auth bypass in Flowiseai Flowise
CVE-2026-41277
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, a Mass Assignment vulnerability in the DocumentStore creation endpoint allows authenticated users to control the primary key (id) and internal state fields of DocumentStore entities. Because the service uses repository.save() with a client-supplied primary key, the POST create endpoint behaves as an implicit UPSERT operation. This enables overwriting existing DocumentStore objects. In multi-workspace or multi-tenant deployments, this can lead to cross-workspace object takeover and broken object-level authorization (IDOR), allowing an attacker to reassign or modify DocumentStore objects belonging to other workspaces. This vulnerability is fixed in 3.1.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.031 · newest: 0.005 · change: -0.026
Affected products
- Flowiseai Flowise — versions < 3.1.0
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-3prp-9gf7-4rxx (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41277?
- CVE-2026-41277 is a high-severity vulnerability in Flowiseai Flowise, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-04-23.
- How severe is CVE-2026-41277?
- High severity. CVSS v3 base score is 8.8 out of 10.