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Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

Type: advisorySource: Official CVE ListKnown exploited1 source record

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.

Announced Group revision 1
Original source ↗

CVE-2026-55255

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-55255

langflow

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "langflow-ai",
    "product": "langflow",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.9.1"
      }
    ]
  }
]
Related CVEs
CVE-2026-55255

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-55255 · Unrated

Langflow · Known exploited (CISA KEV)

Event
#12128 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-55255 · Revision 1Source updated