Vulnerability · Published Jun 20, 2026 · Assigned by VulnCheck

CVE-2026-56276Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override

Medium 6.0

In plain English

A medium-severity security flaw in Flowise from Flowise. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.4%top 69.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	flowise	3.1.2	GHSA-59fh-9f3p-7m39

Affected products (as reported)

Vendor	Product	Versions
Flowise	Flowise	0 – before 3.1.2

Weakness: CWE-915 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

GHSA Advisory GHSA-59fh-9f3p-7m39 vendor-advisory
VulnCheck Advisory: Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override third-party-advisory