Path Traversal in Flowiseai Flowise
CVE-2026-12821
A vulnerability was determined in FlowiseAI Flowise up to 3.1.2. The impacted element is an unknown function of the file packages/components/nodes/documentloaders/S3/S3.ts of the component S3 Document Loader. Executing a manipulation can lead to path traversal. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Flowiseai Flowise — versions 3.1.0, 3.1.1, 3.1.2
Weakness classification (CWE)
References
- vuldb.com/vuln/372611 (vdb-entry)
- vuldb.com/vuln/372611/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-12821 (third-party-advisory)
- vuldb.com/submit/837578 (third-party-advisory)
- github.com/dxz0069/softwareoverflow/blob/main/flowise_s3_loader_object_key_path… (related)
Frequently asked questions
- What is CVE-2026-12821?
- CVE-2026-12821 is a medium-severity vulnerability in Flowiseai Flowise, classified under Path Traversal. CVSS score: 6.3/10. Published 2026-06-22.
- How severe is CVE-2026-12821?
- Medium severity. CVSS v3 base score is 6.3 out of 10.