CVE-2026-12821 FlowiseAI Flowise S3 Document Loader S3.ts path traversal
Remote attackers can exploit a path traversal flaw in the S3 Document Loader to read arbitrary files from the server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12821?
CVE-2026-12821 is a medium-severity path traversal vulnerability in FlowiseAI Flowise, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-12821?
How do I fix CVE-2026-12821?
No fix has been published for CVE-2026-12821 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-12821 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12821 exists.
Sources
Also known as GHSA-67qj-p3v2-73g7.