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

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.

Problem type

Improperly Controlled Modification of Dynamically-Determined Object Attributes

Affected products

Flowise

Flowise

< 3.1.2 - AFFECTED

3.1.2 - UNAFFECTED

References

GHSA Advisory GHSA-59fh-9f3p-7m39

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-59fh-9f3p-7m39

vendor-advisory

VulnCheck Advisory: Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override

https://www.vulncheck.com/advisories/flowise-mass-assignment-in-put-api-v1-user-allows-password-hash-override

third-party-advisory

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-56276

Click to expand

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  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-56276",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-06-20T15:24:44.035Z",
    "dateReserved": "2026-06-20T01:47:54.001Z",
    "datePublished": "2026-06-20T15:24:44.035Z",
    "state": "PUBLISHED"
  },
  "containers": {
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        "dateUpdated": "2026-06-20T15:24:44.035Z"
      },
      "datePublic": "2026-05-14T00:00:00.000Z",
      "title": "Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
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      "affected": [
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