CVE-2026-107366 Langflow OSS Authorization Bypass Through User-Controlled Key
Authenticated users can bypass ownership checks to delete, modify, or hijack other users' messages and sessions in Langflow OSS.
- 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-2026-107366?
CVE-2026-107366 is a high-severity missing authorization vulnerability in IBM Langflow OSS, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.
Weakness: CWE-639
Which versions are affected by CVE-2026-107366?
How do I fix CVE-2026-107366?
No fix has been published for CVE-2026-107366 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-107366 being exploited?
There is no known exploitation of CVE-2026-107366 in the wild and no public exploit code.
Sources
Also known as GHSA-qf42-fp6f-25w9.