Medium severity · published Jun 21, 2026
CVE-2026-12821
FlowiseAI Flowise S3 Document Loader S3.ts path traversal
6.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
Flowise · FlowiseAI
3.1.0; 3.1.1; 3.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12821
github.com
https://github.com/dxz0069/softwareoverflow/blob/main/flowise_s3_loader_object_key_path_traversal_vulndb.md
vuldb.com
https://vuldb.com/cve/CVE-2026-12821
vuldb.com
https://vuldb.com/submit/837578
vuldb.com
https://vuldb.com/vuln/372611
vuldb.com
https://vuldb.com/vuln/372611/cti
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