CVE-2026-12821: FlowiseAI Flowise S3 Document Loader S3.ts path traversal

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-10-25
Weakness: CWE-22

Description

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.

Affected products

FlowiseAI Flowise: 3.1.0, 3.1.1, 3.1.2

References

https://github.com/dxz0069/softwareoverflow/blob/main/flowise_s3_loader_object_key_path_traversal_vulndb.md
https://vuldb.com/cve/CVE-2026-12821
https://vuldb.com/submit/837578
https://vuldb.com/vuln/372611
https://vuldb.com/vuln/372611/cti

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