CVE-2026-56276 Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override
Authenticated users can override password hashes via mass assignment, enabling persistent account takeover and bypassing session invalidation.
- 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-2026-56276?
CVE-2026-56276 is a medium-severity missing authorization vulnerability in Flowise, published on 20 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Flowise before 3.1.2 contains a mass assignment vulnerability in the PUT /api/v1/user endpoint that allows authenticated users to directly modify the credential field without validation. Attackers can bypass password change verification and session invalidation by supplying a crafted password hash, establishing persistent account access after temporary session compromise.
Weakness: CWE-915
Which versions are affected by CVE-2026-56276?
2 open source packages ship an affected version, including flowise.
| Package | Affected | Fixed in |
|---|---|---|
flowise npm | All versions | 3.1.2 |
flowise npm | All versions | 3.1.2 |
How do I fix CVE-2026-56276?
Upgrade flowise to 3.1.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-56276 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56276 exists.
Sources
Also known as GHSA-59fh-9f3p-7m39, GHSA-qr8q-6c25-rppr.