CVE-2026-56276 json
Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override
published 2026-05-20 5 mo ago modified 2026-11-08 24 h ago also EUVD-2026-38119 , GHSA-59fh-9f3p-7m39
- cvss
- 6.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm flowise 3.1.2
- Flowise Flowise 3.1.2
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-59fh-9f3p-7m39 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.0 | 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 |
| CNA | 4.0 | 6.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | flowise | <3.1.2 |
3.1.2 |
Affected products
- Flowise Flowise
Classification
- Weakness
-
- CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
References
-
github.com
/FlowiseAI/Flowise/security/advisories/GHSA-59fh-9f3p-7m39
vendor-advisory, exploit, web
-
vulncheck.com
/advisories/flowise-mass-assignment-in-put-api-v1-user-allows-password-hash-override
third-party-advisory
-
github.com
/FlowiseAI/Flowise
package
Sources
- CVE List CVE-2026-56276
- GitHub Advisory GHSA-59fh-9f3p-7m39
- NVD CVE-2026-56276
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.